• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A control channel that supports traffic control within an epoch is divided into two control subchannels, each of which is less than or equal to about half the epoch, and which occurs in succession in time. Slot assignment data may be transmitted and received independently on subchannels. One subchannel may be used to transmit forward slot assignment data, and the other subchannel may be used to transmit reverse slot assignment data. The channel divided into two subchannels may be a paging channel. Forward and reverse slot assignment data may be transmitted between the base station processor and the field unit. Forward and reverse traffic data may be staggered by at least about half of the epoch. The transmission of traffic data occurs within approximately two epochs after allocation.
    公开号:KR20040071333A
    申请号:KR10-2004-7011359
    申请日:2003-01-22
    公开日:2004-08-11
    发明作者:존 비. 주니어. 콘네트；케빈 피. 존슨；조오지 알. 주니어. 넬슨
    申请人:탠티비 커뮤니케이션즈, 인코포레이티드；
    IPC主号:
    专利说明:

    Method and apparatus for allocating traffic channel in communication system {ALLOCATING TRAFFIC CHANNELS IN A COMMUNICATIONS SYSTEM}
    [2] In a wireless communication system, wireless channels provide a physical link between communication units. The equipment of such a system is generally one that communicates with a network, such as a public switched telephone network (PSTN) for voice communications, or a plurality of end user computing devices, such as user PCs and a processor, that communicates with a data network for data communications. It includes the above access terminals. The combination of access terminal and end user computing device is referred to as a field unit or a remote unit. The wireless channels include a forward channel for message transmission from the base station processor to the field units and reverse channels for message transmission from the field units to the base station processor.
    [3] In the case of such a wireless data system used to provide a wireless Internet connection, each base station processor serves many field units. However, radio channels are finite resources and are therefore allocated by the scheduler between field units serviced by the base station processor. This scheduler allocates radio channels between field units based on traffic demand.
    [4] One method of supporting on-demand connections between multiple users is referred to as time division multiple access (TDMA), where each wireless channel has specific access terminals only during a given time interval or time slot. Is assigned. The second method of supporting on-demand access between multiple users is called code division multiple access (CDMA), which allows multiple users to share the same radio spectrum. Instead of dividing the radio frequency (RF) spectrum into narrowband channels (e.g., 30 kHz in an analog radio system), CDMA uses many channels on the wideband spectrum (1.25 MHz for the North American CDMA standard known as IS-95). Spread. To distinguish a particular channel from other channels using the same spectrum at the same time, a pseudo-random (pseudo noise or PN) code is assigned to each user. Many users (up to 64 for IS-95) share the same spectrum, each using a unique code, and decoders use the codes at each terminal in a manner similar to a tuner that distinguishes different frequencies in existing systems. Separate.
    [5] PN codes used to define a communication channel generally have a defined code repetition period or code epoch. For each such epoch duration (referred to as a slot), the base station central control system further schedules forward traffic channel assignments (forward slot assignment or "FSA") and reverse traffic channel assignments (reverse slot assignment or "RSA"). can do. This is generally done in such a way that all channels are assigned to as many active users as possible. Unfortunately, the need to allocate and reallocate PN code channels among a large number of users can cause delays. In particular, when the PN code is reassigned to different user connections, it takes a certain time period for the code demodulators of the receiver to lock to the new code. This introduces latency on receipt of data packets that must be delivered on the coded channel.
    [6] To coordinate traffic channels, the base station processor communicates with a given field unit in the following manner. First, the base station processor checks for available channels. The base station processor then sends a message to a given field unit to establish an available channel. A given field unit processes these messages (2-3 epochs) to set up the channel and send a setup completion confirmation message (1-2 epochs). To release the channel setup, the base station sends a message to the given field unit, which processes this command (1-2 epoch) and sends back an acknowledgment message (1-2 epoch).
    [1] The present invention relates to a method and apparatus for allocating a traffic channel in a communication system.
    [13] 1 is a block diagram of a wireless communication system suitable for performing the wireless paging channel techniques described herein.
    [14] 2 is a timing diagram of a technique for allocating a forward channel in accordance with the principles of the present invention used in the system of FIG.
    [15] 3 is a timing diagram of a technique for allocating a reverse channel in accordance with the principles of the invention employed in the system of FIG.
    [16] 4 is a timing diagram of an alternative technique for allocating a reverse channel in accordance with the principles of the invention used in the system of FIG.
    [7] A communication system using the principles of the present invention reduces packet latency and thereby improves response time for establishing traffic channels in communication systems, such as an on-demand access packet switched CDMA communication system. These improvements apply to both forward and reverse traffic channels.
    [8] Channel code assignment is pipelined downward from the base station transceiver (BTS) to all mobile units in the cell zone associated with the BTS, so that substantial traffic data transmission can begin within approximately two epochs after channel assignment. Keeping this delay to a minimum improves latency.
    [9] There are at least three features to help maintain this short delay: (i) A control channel, such as a paging channel, can be divided into two control subchannels or half-channels (optionally forward half-channel and reverse). Dividing into control subchannels, such as half-channels, wherein in the case of two control subchannels, the new split paging channels are approximately half the duration of the standard control channels (eg, half of the epoch). ) And less than or equal to (ii) staggering forward and reverse traffic channels by approximately half of the epoch and removing the acknowledgment returned to the BTS, because the slot allocation / deallocation command is This is because it is redundant (i.e., sent several times for contiguous slot allocation). Forward and reverse slot assignment data may be sent in objects that are less than or equal to about half of the epoch duration, for example, field units from the base station processor in respective forward and reverse subchannels, such as paging subchannels. Is sent to.
    [10] These two features can improve latency by one or two epochs per forward and reverse channel assignment. Thus, this represents a significant improvement in the time response to the user.
    [11] In one embodiment, the present invention may be used in link layer software on base stations and field units to improve channel latency and may be used by any system using a CDMA packet switched communication system.
    [12] The above described objects, features and advantages of the present invention and other objects, features and advantages will become apparent from the following detailed description of the preferred embodiments of the present invention as described with reference to the accompanying drawings, in which like reference is made to the accompanying drawings. Reference characters refer to like parts throughout the different figures. The drawings are not necessarily to scale and focus instead on the principles of the invention.
    [17] Description of preferred embodiments of the present invention is as follows.
    [18] 1 illustrates a wireless telecommunication system suitable for reducing packet latency in accordance with the principles of the present invention. Many data processing devices 12a-12e, such as personal computers (PCs), personal digital assistants (PDAs), data-enabled mobile telephones, and the like (collectively PCs) are connected to the access terminals AT via wired connections 20; In communication with a subset of 14a-d). Wired connection 20 typically follows a wired protocol such as Ethernet with embedded TCP / IP packets. The combination of the PC 12 and the AT 14 may be referred to as a field unit 15 or a remote unit. In the case of the second field unit 15b, the PC associated with the AT 14b is embedded in the AT 14b and is therefore not shown.
    [19] Field units 15a-15d are in wireless communication with a base station processor (BSP) 16 via a radio link 26. Wireless link 26 may follow a wireless protocol such as IS-95 or another wireless protocol that supports communication over an RF medium.
    [20] The base station processor 16 is also connected to a public access network 18, such as the Internet, via an internetworking gateway 24. The internetworking gateway 24 is typically a bridge, router, or other connection to the network backbone, and may be provided by a remote provider such as an internet service provider (ISP). In this way, the end user of the PC 12 is provided with a wireless connection to the public access network 18 via the AT 14 and the base station processor 16.
    [21] Typically, user PC 12 transmits a message to field unit 15 via a wired link 20, such as a local area network (LAN) or bus connection. The field unit 15 sends a message to the base station processor 16 via the radio link 26. The base station processor 16 sends a message to the public access network 28 via an internetworking gateway 18 for delivery to a remote node 30 located on the network 28. Similarly, the remote node 30 located on the network can send the message to the field unit 15 by sending the message to the base station processor 16 via the internetworking gateway 24. The base station processor 16 transmits a message over the radio link 26 to an access terminal 14 serving the PC 12. The access terminal 14 sends a message to the PC 12 via the wired link 20. Therefore, PC 12 and base station processor 16 may appear to be the end point of wireless link 26.
    [22] As described above, there are typically more field units 15 than there are available wireless channel resources. For this reason, wireless channels are allocated in accordance with some type of request-based multiple access technique to maximize the use of available wireless channels. Multiple access is often provided at the physical layer or by techniques that adjust radio frequency signals, such as time division multiple access (TDMA) or code division multiple access (CDMA) techniques. In any case, the state of the radio spectrum is the medium that is expected to be shared. This is very different from the conventional wired environment for relatively inexpensive data transmission, since wired media such as telephone lines or network cabling are always acquired and maintained open.
    [23] In typical wireless transmissions, transmission messages often lead to return acknowledgment messages. The radio channel is assigned to transmit the message, and the transmit radio channel is allocated in the opposite direction to send the return message. Radio channel assignment may occur by a variety of methods well known in the art.
    [24] 2 is a timing diagram 30 illustrating latency improvement (ie, reduction) for allocating forward channels of the wireless system 10. This improvement is desirable for packet switched CDMA communication systems but can be used to reduce latency in TDMA or other multiplexing systems with forward slot allocation. In the present CDMA case, the forward link from base station processor 16 to field units 15 includes a paging channel, multiple traffic channels, and maintenance channels. Timing diagram 30 includes the relative signal timing of the paging and traffic channels.
    [25] Timing diagram 30 is horizontally separated into four epochs 32-1 through 32-4, and is vertically separated into a sequence of steps used to transmit and activate forward channels. In a first step 34, the base station processor 16 loads the forward slot assignments into the paging / F buffer object. The paging / F buffer object contains conventional overhead information as a conventional standard buffer object, but only contains traffic channel allocation data for forward traffic channels, and thus has only a duration that is half the epoch. In a second step 36, the paging / F buffer object is transmitted by the base station processor 16 to the field unit 15 and demodulated by the field unit 15. In a third step 38, field unit 15 decodes the paging / F buffer object, extracts forward channel assignments, and configures receiver (s) for the forward channels. In a fourth step 40, within half of the epoch after decoding the paging / F buffer object, field unit 15 decodes the data traffic on the forward channels.
    [26] The paging channel may be divided into subchannels for transmitting forward slot allocation data and subchannels for transmitting reverse slot allocation data. Each subchannel may be less than or equal to about half of the epoch length and may be referred to as a "forward" half-channel and a "reverse" half-channel.
    [27] It should be noted that the paging channel may be further subdivided into smaller slotted subchannels that are less than or equal to approximately 1 / n th of the epoch length. Also, the lengths of the subchannels can be different as long as the combined length is less than or equal to the epoch. It should be noted that the segmented channel may be a channel other than a paging channel, such as a maintenance channel or an unused traffic channel.
    [28] The rest of the description assumes that the paging channel is divided into two subchannels called half-channels.
    [29] As shown in FIG. 2, the forward paging / F object loaded in the first epoch 32-1 is transmitted over the first half-channel within the first half epoch of the epoch 32-2, and also the epoch ( Demodulated in the same first half of 32-2). The second half of epoch 32-2 is used by field unit 15 to decode slot assignment data transmitted in the form of messages or control data and to configure forward traffic channels. This means that forward channel assignments can be located in one epoch (for example, epoch 32-2) of the forward half-channel, and forward traffic can be located at the next epoch (eg, epoch 32-3). do. This is, for example, the overall extra epoch normally required to demodulate a standard full paging channel buffer object that fills the entire epoch 32-2 but is not ready to send traffic data to the next two epochs, the epoch 32-4. Decreases in time.
    [30] 3 is a timing diagram 50 illustrating latency improvement (ie, reduction) for allocating a reverse channel of the wireless system 10. Forward epochs 32 and corresponding set of reverse epochs 52 are provided to indicate the timing relationship between forward and reverse directions. The method defined in FIG. 3 includes reverse paging / R steps 54a-60 similar to forward paging / F steps 34-40 provided in FIG.
    [31] Referring to FIG. 3, as described above, the paging channel is divided into two half-channels. The first half-channel may be used to transmit a half sized paging / F object (as discussed above) and the second half / channel may be used to transmit a half sized paging / R object. Can be. For reverse traffic, a 1/2 sized paging / R object contains overhead data of a standard object, as in the case of a 1/2 sized paging / F object, and likewise, a 1/2 sized paging / R object Also includes reverse slot assignment (RSA) data that can be transmitted and demodulated within the second half epoch of the second epoch 32-2. Comparing step 36 with step 56 reveals the timing relationship of the forward and reverse half-channels.
    [32] Reverse epoch 52 may be staggered by half epoch to reduce the amount of delay between transmission of reverse slot assignments (step 56) and transmission of reverse traffic (step 60). This means that the reverse channel assignment can be transmitted from one epoch 52-2 to the reverse half channel and the reverse traffic data can transmit the reverse channel defined by the reverse slot assignment data in the next epoch 52-3. .
    [33] Splitting a paging channel into two channels of half epoch duration and sending the paging / F and paging / R objects independently will result in a full standard paging channel with paging / F and paging / R objects sent in association with the entire epoch. The excess epoch needed to demodulate is saved. Also, by making the paging / R object only half an epoch, the base station processor 16 may delay loading of the reverse slot assignments by half epochs that require late in allocations needed to wait for another epoch ( For example, starting loading at the beginning of the first reverse epoch 52-1 rather than at the beginning of the first forward epoch 32-1).
    [34] This system allows the base station processor 16 to load the reverse slot assignments 54a until after the first forward epoch 32-1 as defined by the loading step 54b in the timing diagram 50 of FIG. 4. In case of delay it can be further improved.
    [35] It is assumed that slot assignments arrive at the physical layer and are transmitted in one epoch between the base station processor 16 and the field unit 15. This results in another half epoch improvement over the entire latency.
    [36] It should be understood that the processes described herein may be provided by software, firmware, or hardware. The software may be stored in RAM, ROM, optical or magnetic disks or other storage media. The software is loadable and executable by a processor that interacts with an apparatus capable of providing wired or wireless communication functions described or known herein to operate in the system 10 of FIG. 1. The software may be distributed by physical or wireless distribution methods, which are usually used commercially.
    [37] Although the invention has been described with reference to preferred embodiments, those skilled in the art should understand that various modifications and changes can be made without departing from the scope of the invention as defined by the appended claims.
    权利要求:
    Claims (30)
    [1" claim-type="Currently amended] A method for setting up a traffic channel in a TDM communication system having time division multiplexing (TDM) slots approximately equal to the time interval of a pseudonoise (PN) code epoch, the method comprising:
    Dividing the control channel into a first control subchannel less than or equal to about half epoch and a second control subchannel less than or equal to about half epoch in the same control channel, wherein the first and second control subchannels are temporal; Occurs continuously with; And
    Independently transmitting slot assignment data on the first and second control subchannels to allocate respective TDM slots.
    [2" claim-type="Currently amended] The method of claim 1, wherein the control channel is a paging channel.
    [3" claim-type="Currently amended] 2. The method of claim 1, wherein the step of transmitting slot assignment data comprises transmitting forward slot assignment data on the first control subchannel and transmitting reverse slot assignment data on the second control subchannel. How to.
    [4" claim-type="Currently amended] 4. The method of claim 3, wherein transmitting the slot assignment data comprises separating the forward and the reverse slot assignment data respectively in an amount capable of processing data within approximately the next epoch after reception.
    [5" claim-type="Currently amended] 4. The method of claim 3, further comprising staggering transmission of a reverse traffic channel defined by the reverse slot assignment data from transmission of a forward traffic channel defined by the forward slot assignment data.
    [6" claim-type="Currently amended] 6. The method of claim 5, wherein said staggering step is at least approximately 1/2 epoch.
    [7" claim-type="Currently amended] 4. The method of claim 3, further comprising collecting reverse channel assignment requests while transmitting slot assignment data on the first subchannel.
    [8" claim-type="Currently amended] An apparatus for setting up a traffic channel in a TDM communication system having time division multiplexing (TDM) slots approximately equal to the time interval of a pseudo noise (PN) code epoch,
    A processor for dividing a control channel into a first control channel less than or equal to about half epoch and a second control subchannel less than or equal to about half epoch in the same control channel, wherein the first and second control subchannels are Occurs continuously; And
    A transmitter coupled to the processor, the transmitter independently transmitting slot assignment data to the first and second control subchannels to allocate respective TDM slots.
    [9" claim-type="Currently amended] 9. The apparatus of claim 8, wherein the control channel is a paging channel.
    [10" claim-type="Currently amended] 10. The apparatus of claim 8, wherein the transmitter transmits forward slot assignment data on the first control subchannel and reverse slot assignment data on the second control subchannel.
    [11" claim-type="Currently amended] 11. The apparatus of claim 10, wherein the processor separates the forward and reverse slot assignment data, respectively, in an amount capable of processing data within approximately the next epoch after reception.
    [12" claim-type="Currently amended] 12. The apparatus of claim 10, wherein the transmitter staggers transmission of a reverse traffic channel defined by the reverse slot assignment data from transmission of a forward traffic channel defined by the forward slot assignment data.
    [13" claim-type="Currently amended] 13. The apparatus of claim 12, wherein the staggering is at least approximately 1/2 epoch.
    [14" claim-type="Currently amended] 11. The apparatus of claim 10, wherein the processor collects the reverse channel assignment requests while transmitting slot assignment data on the first control subchannel.
    [15" claim-type="Currently amended] An apparatus for setting up a traffic channel in a TDM communication system having time division multiplexing (TDM) slots approximately equal to the time interval of a pseudo noise (PN) code epoch,
    Means for dividing a control channel into a first control subchannel less than or equal to about 1/2 epoch and a second control subchannel less than or equal to about 1/2 epoch, wherein the first and second control subchannels are Occurs continuously in time; And
    Means for independently transmitting slot assignment data to the first and second control subchannels for allocating respective TDM slots.
    [16" claim-type="Currently amended] A method for setting up a traffic channel in a TDM communication system having time division multiplexing (TDM) slots approximately equal to the time interval of a pseudonoise (PN) code epoch,
    Dividing the control channel into a first control subchannel less than or equal to about 1/2 epoch and a second control subchannel less than or equal to about 1/2 epoch, wherein the first and second control subchannels are Occurs continuously in time; And
    Independently receiving slot assignment data in the first and second control subchannels for allocating respective TDM slots.
    [17" claim-type="Currently amended] 17. The method of claim 16, wherein the control channel is a paging channel.
    [18" claim-type="Currently amended] 17. The method of claim 16, wherein the step of receiving slot assignment data comprises receiving forward slot assignment data on the first control subchannel and receiving reverse slot assignment data on the second control subchannel. How to.
    [19" claim-type="Currently amended] 19. The method of claim 18, further comprising processing the forward and reverse slot assignment data within approximately the next epoch after reception.
    [20" claim-type="Currently amended] 19. The method of claim 18, further comprising receiving a reverse traffic channel defined by the reverse slot assignment data staggered from the reception of a forward traffic channel defined by the forward slot assignment data.
    [21" claim-type="Currently amended] 21. The method of claim 20, wherein the forward and reverse traffic is staggered at least about 1/2 epoch.
    [22" claim-type="Currently amended] 21. The method of claim 20, wherein the step of receiving comprises receiving the reverse slot assignment data corresponding to reverse channel requests transmitted while receiving the first control subchannel.
    [23" claim-type="Currently amended] An apparatus for setting up a traffic channel in a TDM communication system having time division multiplexing (TDM) slots approximately equal to the time interval of a pseudo noise (PN) code epoch,
    A processor that splits the control channel into a first control subchannel less than or equal to about 1/2 epoch and a second control subchannel less than or equal to about 1/2 epoch, wherein the first and second control subchannels are temporal Occurs continuously with; And
    And a receiver for independently receiving slot assignment data in the first and second control subchannels for allocating respective TDM slots.
    [24" claim-type="Currently amended] 24. The apparatus of claim 23, wherein the control channel is a paging channel.
    [25" claim-type="Currently amended] 24. The apparatus of claim 23, wherein the receiver receives forward slot assignment data on the first control subchannel and reverse slot assignment data on the second control subchannel.
    [26" claim-type="Currently amended] 26. The apparatus of claim 25, wherein the processor processes the forward and reverse slot assignment data within approximately the next epoch after reception.
    [27" claim-type="Currently amended] 27. The apparatus of claim 25, wherein the receiver receives a reverse traffic channel defined by staggered reverse slot assignment data from a forward traffic channel defined by the forward slot assignment data.
    [28" claim-type="Currently amended] 28. The apparatus of claim 27, wherein the staggering is at least about 1/2 epoch.
    [29" claim-type="Currently amended] 26. The apparatus of claim 25, wherein the receiver receives the reverse channel assignment data corresponding to reverse channel requests transmitted while receiving the first control subchannel.
    [30" claim-type="Currently amended] An apparatus for setting up a traffic channel in a TDM communication system having time division multiplexing (TDM) slots approximately equal to the time interval of a pseudo noise (PN) code epoch,
    Means for dividing the control channel into a first control subchannel that is less than or equal to about 1/2 epoch and a second control subchannel that is less than or equal to about 1/2 epoch, wherein the first and second control subchannels are temporal. Occurs continuously with; And
    Means for independently receiving slot assignment data in the first and second control subchannels for allocating respective TDM slots.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2002-01-22|Priority to US35083502P
    2002-01-22|Priority to US60/350,835
    2003-01-22|Application filed by 탠티비 커뮤니케이션즈, 인코포레이티드
    2003-01-22|Priority to PCT/US2003/001967
    2004-08-11|Publication of KR20040071333A
    2018-12-31|First worldwide family litigation filed
    优先权:
    申请号 | 申请日 | 专利标题
    US35083502P| true| 2002-01-22|2002-01-22|
    US60/350,835|2002-01-22|
    PCT/US2003/001967|WO2003063518A2|2002-01-22|2003-01-22|Allocating traffic channels in a communications system|
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