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CN101043458A - Method for variable block scheduling indication by an uplink state flag in a packet data communication system - Google Patents

Method for variable block scheduling indication by an uplink state flag in a packet data communication system Download PDF

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Publication number
CN101043458A
CN101043458A CNA2007100936064A CN200710093606A CN101043458A CN 101043458 A CN101043458 A CN 101043458A CN A2007100936064 A CNA2007100936064 A CN A2007100936064A CN 200710093606 A CN200710093606 A CN 200710093606A CN 101043458 A CN101043458 A CN 101043458A
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mobile radio
usf
blocks
station
radio blocks
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CN101043458B (en
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D·图里纳
B·Y·珀松
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Abstract

A packet data communication system uses an USF (Uplink State Flag) transmitted on the downlink and interleaved with downlink data, to schedule traffic on the uplink for one or several mobile users utilizing the same physical channel. The USF indication is made variable and defined in the control signaling at setup of a packet transmission. An USF indicates to a mobile that one or several consecutive radio blocks is reserved for uplink transmission from a specific mobile. The mobile does not have to receive the USF during the remaining period defined by the number of radio blocks scheduled. The solution is especially advantageous in combination with adaptive antennas when all radio blocks on the downlink transmissions do not have to be broadcast to all users on a certain channel.

Description

The method of dispatching with uplink line state sign indication variable-block in the packet data communication system
Relate generally to packet data communication system of the present invention in more detail, relates to the method and apparatus of dynamic transmission resource allocation.
The explosivity of the growth of business communications system, especially cellular radio and telephone is grown up and has been forced system designer to seek the approach that increases the capacity of system under communication quality is not reduced to situation below the threshold value that the user can allow.Simultaneously, the user is used for transfer of data to mobile communication equipment more prevalently, rather than is used for voice.As the business that more and more is widely used for radio communications system, people discuss the possibility that sends and receive Email and use Web-browser to come the access World Wide Web (WWW) day by day continually.The response this point, communication system designer is sought the approach of being to and from mobile subscriber's transmitting data information effectively.
Between the requirement of data communication and for example voice communication, exist the difference of essence.For example, to having relatively high expectations of postponing, and data communication is to the having relatively high expectations of mistake as the voice of real time business, and lower to the requirement that postpones simultaneously.Compare the use that is more suitable in the packet communication protocol of transfer of data with circuit switched protocol and begin in cellular communications system, to find application.To Packet Service both had been attached to the GSM cellular system, is attached to the DAMPS cellular system again and carries out standardization at present.
Today, gsm system provides a kind of circuit switched data services that can be used for outer data network interconnection.Circuit switched data services both had been used in circuit switching, was used for packet-switched data communication again.In order to make packet switched data communication more effective, introduced the new packet switched data service of a kind of GPRS of being called as (general packet radio service), as the part of GSM.GPRS has considered packet switching communication, for example, and IP or virtual circuit switched communication.GPRS had both supported connectionless protocol (for example, IP), to support Connection-oriented Protocol (X.25) again.One of advantage that adopts the packet switched data communication agreement is that single transfer resource can be shared between a plurality of users.Like this, for example, under the situation of GSM cellular system, a time slot on the radio frequency carrier can be used to receive and send data by a plurality of mobile subscribers.The transfer resource of sharing both had been used for uplink by the network side management of cellular system, was used for the downgoing line transmission again.
GPRS is a kind of gsm service and uses a part of GSM information basic facilities.Those parts of gsm communication system are described in European telecommunications standards institute (ETSI) file ETS 300 574, and this file is included in that this is for referencial use.
An advantage introducing packet data protocol in cellular system is to support high data rate transfer, and realizes the flexibility of radio frequency bandwidth on the radio interface and effectively utilization simultaneously.The notion of GPRS wherein allows unique user to take more than one transfer resource simultaneously for a kind of what is called " multi-slot operation " design.
Fig. 1 illustrates the overview of GPRS network architecture.Information block from external network 122,124 enters GPRS network at GGSN (gateway GPRS service node) 120 places.This minute group selection provides the route of the SGSN (serving GPRS support node) 116 of service to the zone at the GPRS mobile subscriber place of institute's addressing via underlying network 118 arrival from GGSN 120 then.The route of this minute group selection in the GPRS of special use transmission from SGSN to correct BBS (base station system).GPRS register 115 will keep all GPRS reservation data.The GPRS register can with can be not do not integrate with the HLR (domestic address register) 114 of gsm system yet.User data can exchange between SGSN and MSC, guaranteeing business interaction, such as restricted roaming etc.
Fig. 2 illustrates the flow process of gprs system packet switched.D.Turina etc. are at " suggestion of the multi-slot MAC layer operation that Packet Data Channel is used among the GSM " ICUPC, and 1996, Vol.2 has also done brief description to this in pp.572-576 one literary composition, and this literary composition is attached, and this is for referencial use.
The grouping of receiving from network 210 is mapped on one or more logical connection control (LLC) frames 212, and the latter comprises information field, frame head (FH) and FCS (FCS).A LLC frame is mapped on a plurality of radio link data blocks (RLC data block) 214, and wherein each all comprises build (BH), information field and block check sequence (BCS) (BCS), and it can be used for the mistake in the inspection message field on receiver.Can be appreciated that as the professional and technical personnel piece is can be by the least part of radio interface from new transmission in the grouping.The RLC piece further is mapped on the physical layer radio.In gprs system, a radio blocks is mapped on 4 standard bursts that send in succession on the GSM physical channel.
Build comprises uplink Status Flag (USF) field, to support the dynamic media access method on the uplink.USF is used in the Packet Data Channel, so that allow multiplexed from several mobile subscribers' radio blocks, that is shares the dynamic assignment of transfer resource in the uplink.USF comprises 3 information bits, uses for the coding of 8 the multiplexed different USF states that are used for uplink communication.USF is included in the starting position of each radio blocks that transmits in the downgoing line, that is intersects with downlink communication to specific mobile subscriber.Because USF sends in each radio blocks of downgoing line, so use all mobile subscribers of dynamic allocation method and shared some transfer resources all must constantly monitor the downgoing line channel, whether show that any mobile subscriber is had idle uplink transmission so that determine USF.If mobile subscriber of USF indication then allows to carry out uplink transmission in next uplink radio blocks.This technology is illustrated among Fig. 3, and wherein USF=R1 shows that mobile subscriber 1 (MS1) can be used for 4 pulse trains subsequently to transmit in uplink.But, under the situation that multi-slot distributes, when a mobile subscriber is assigned with an above time slot in each TDMA (time-division multiplex) frame, in 4 tdma frame processes, can transmit more than one RLC piece, each single RLC piece always intersects on the physical channel through 4 pulse trains, that is on the time slot.According to Fig. 3, if USF=R2, then this shows that mobile subscriber 2 (MS2) can be used for 4 pulse trains subsequently to transmit in uplink then.Numerical value F represents a grouping direct access communications channels (PRACH) that is used for starting uplink transmission by the mobile subscriber.
When considering the adaptive antenna array of the effective use that use to increase cellular system capacity and rare radio resource, adopt the shortcoming of above-mentioned agreement just to become obviously.The realization of aerial array can be considered more effective transmission of radio signal and reception, because the energy that is transmitted can point to certain receiver with antenna lobe.This has limited the whole interference level in the cellular system significantly, and the emission power output may reduce and be limited to and departs from for example some direction of base station transmitter.
It is of crucial importance to the capacity that increases cellular system in the future to effectively utilize adaptive antenna.If but for example intersect in the identical pulse train with the downgoing line control signaling of planning to use for other users, then for realizing that the performance gain that adaptive antenna reached is conditional at specific mobile subscriber's Down-Link Communications.An example is the above-mentioned USF sign that is included in in specific user's the downgoing line transmission.Different mobile subscribers is wide apart geographically, so can not only focus on the signal energy of being transmitted on one or several direction.Similarly, the transmission for pointing to more than one mobile subscriber is difficult to obtain effective power control algorithm.
Adopt the another one shortcoming of above-mentioned agreement to be, (no) may introduce new modulation for some radio blocks on the downgoing line.In other words, the proposition of the latest development among the GSM is used new higher levels of modulation to the user that radio condition well thereby on the whole can increase this user's data speed and throughput of system.It is multiplexed preferably can freely to utilize modulation existing and new on the downgoing line that radio blocks is carried out, thereby obtains the relaying gain.In current agreement, monitoring and must arrive under the situation of the USF in the radio blocks that uses existing modulation that this is infeasible at a GPRS mobile radio station.
A possibility that overcomes this shortcoming is, initially set up signaling stipulate assorted petty the time user be allowed under situation about sending on the uplink, use fixing distribution media access method.But, since for example on allocation of transmission resources flexibility increase, it is multiplexing beneficial to have dynamic multipath on uplink.
An object of the present invention is by introducing the efficient that extra flexibility improves the packet data communication system that uses dynamic resource allocation method aspect multiplexed in the uplink transmission resource.Utilizing USF to represent that the mobile subscriber is scheduled the radio blocks that the transmission any number occurs in succession on physical channel on the downgoing line, the mobile subscriber needn't monitor USF in the process of after this several downlink piece, its number is determined according to the indication that provides in giving the channel assignment message of particular mobile station.
Regulation reception USF shows to the mobile subscriber to utilize uplink to distribute in initialization signaling when allocation of transmission resources that is physical channel.In tdma system, physical channel can be a time slot.In the multi-slot system, can distribute several time slots, but will specify different USF values for each distributed time slot, the latter can represent also can not be illustrated in the radio blocks transmission that has same number continuous in the uplink.In addition, according to the difference of each channel allocation, the up-link wireless electricity piece transmission that different numbers once occur representing of USF to different users.By be the transmission of the continuous radio blocks of uplink transmission scheduling any number on physical channel, before dispatching last uplink radio blocks, the mobile subscriber just there is no need to monitor USF in that transmission course.As a result, the transmission on the downgoing line can finish more effectively with adaptive antenna and power control algorithm, and whole interference is also reduced.
According to of the following description of reference accompanying drawing to most preferred embodiment, above-mentioned purpose of the present invention and feature be will be more readily apparent from, in the accompanying drawing:
Fig. 1 illustrates the architecture of GPRS network;
Fig. 2 illustrates transmitted in packets flow process and information mapping in the exemplary packet data communication system;
Fig. 3 illustrates the multiplexed USF sign of expression uplink transmission;
It is multiplexed that Fig. 4 illustrates the uplink of being carried out by the USF that represents a uplink radio blocks transmission;
Fig. 5 illustrates by the uplink of the USF execution of the more than one uplink radio blocks transmission of representative multiplexed; And
Fig. 6 illustrates according to exemplary communication state in the packet data communication system of the present invention.
Now the present invention is described with regard to gprs system, wherein for utilize USF transmission method in the downgoing line multiplexed mobile subscriber dynamic resource allocation method is provided.The mobile subscriber of a shared transfer resource monitors the USF transmission in the downgoing line, so that determine when the permission uplink.
Up dynamic allocation method according to traditional system, is based on the USF granularity of a radio blocks, that is the appearance of a USF determines that uplink only keeps a piece in the descending radio blocks.This is shown in Fig. 4 for example, and each downgoing line radio blocks comprises the USF that distributes up of the next one to the mobile subscriber here.
The present invention recognizes, the USF granularity of channel allocation can be changed into several pieces in succession from one each time, this means that the every appearance of the USF that is assigned with once will be moved user interpretation for distributing several radio blocks in succession to uplink.This technology has been dwindled the flexibility of dynamic allocation method slightly, still provides benefit for other application.
Because keeping a plurality of on the circuit of reaching the standard grade can begin anywhere, so preferably only broadcast suitable USF in the piece of first in a series of, and the not value of using of transmitting USF simultaneously in remaining radio blocks carries out uplink so that prevent other users.The mobile subscriber who had received the distribution indication of several radio blocks in succession in the past will ignore it in the cycle that is limited by the uplink distribution when receiving the USF of so not usefulness.For other purposes, for example for have way in some cases, such as in the transmission course of some control information, making the mobile subscriber keep not transmitting, on Packet Data Channel, untapped USF must be arranged.
USF occurs distributing for example 4 radio blocks in succession once for an ascending time slot, just might more freely use remaining 3 radio blocks on downgoing line.This, has 3 to send in the lobe of the mobile radio station (MS) that points to the current descending radio blocks that is receiving in downgoing line in 4 radio blocks here the use of simplified self-adaptive aerial array widely at least.This distribution example is shown in Fig. 5 for example.In Fig. 5, illustrate one and show the USF that 4 radio blocks is in succession distributed to mobile subscriber 1.This distribution is only represented in first radio blocks, and supposition 3 radio blocks then can be used for uplink.Follow these 3 downgoing line pieces in succession distributing to mobile subscriber 1 radio blocks back in expression to comprise untapped USF (Un), the latter shows that the mobile subscriber who receives it must not transmit on uplink.In the process of this time, downlink transfer needn't reach mobile subscriber 1 for the multiplexed purpose of uplink, can transmit lobe with aerial array on the contrary and point to the mobile subscriber who receives on downgoing line.Sometimes this is certainly the same with the mobile subscriber that scheduling is transmitted on uplink.
The professional and technical personnel will appreciate that, the number of radio blocks in succession that is shown in Fig. 5 for example is as just example.In fact, can on uplink, dispatch the radio blocks in succession of any number.The meaning of USF defines when distributing to the mobile subscriber in initialization signaling and physical channel.In an alternate embodiment of the present invention, the meaning of USF for, for example all mobile subscribers are identical in certain sub-district, also can broadcast the piece number that the mobile subscriber can be transmitted.USF itself also can be used for regulation and prepare the number of the radio blocks in succession of transmission.Under these circumstances, USF can require extra information symbol that the suitable number of piece is passed to the mobile subscriber.
Fig. 6 illustrates the situation according to exemplary communication of the present invention, and wherein 3 mobile subscribers share physical channels.Be noted that the control signaling is not shown among the figure, because this is to suitably understanding the present invention and unnecessary.
Indicated as tdma frame diagram among Fig. 6, mobile subscriber 1 for example receives USF (R1) on a time slot on the physical carrier of appointment, shows in the cycle of subsequently 4 continuous radio blocks to allow uplink.In GPRS, this is equivalent to 16 tdma frames subsequently.Represent mobile subscriber 1 USF to be included in mobile subscriber 3 downlink transfer.This descending radio blocks is to broadcast to all mobile subscribers that share same channel.Mobile subscriber 2 may also receive this downlink transfer and show do not have resource allocation to give the USF of uplink to mobile subscriber 2.In radio blocks subsequently, the uplink from mobile subscriber 1 appears among the tdma frame 8-11, and the downlink transfer to mobile subscriber 3 is then continuing simultaneously.In this descending radio blocks, to send,, mobile subscriber 1 distributed to uplink only because having known 4 radio blocks in succession to mobile subscriber 3.Being inserted in the downgoing line between untapped USF (Un), on uplink, transmit then to prevent other mobile subscriber.In the process of the electric piece of the up-link wireless of this last scheduling, tdma frame 19-22, must be once more to all mobile subscriber's broadcast downstream transmission, the uplink of the piece in succession that receives another number with the mobile subscriber 2 (R2) that guarantees to represent among the USF and other users is distributed.Then, the said process of incident occurs once more.
Be noted that the mobile subscriber can have extra physical channel, for example, be distributed in the time slot on same or the different frequency, wherein can application class like, but not necessarily the same USF indication.A USF can represent any number radio blocks in succession, and determines this number at each mobile subscriber in the initialization signaling.
In Fig. 6, two antenna directions or lobe 610 and 612 have been described.These lobes illustrate and comprise that the downlink transfer of not using USF can only point to the mobile subscriber who is receiving data on downgoing line, that is the mobile subscriber in above-mentioned example 3.This is possible in a system that realizes adaptive antenna array.By the emission edge of signal energy built in certain angle intervals, perhaps only (or several) mobile subscriber is carried out power control, just can realize obviously reducing of interference level.
Although describe the present invention with regard to gprs system, the professional and technical personnel will be appreciated that, also can similarly change uplink is multiplexed on other block data systems, and can realize similar benefit.Thereby, should not think that the present invention is only limited to embodiment described above, the present invention only comprises that by subsequently preparation its all grade determines when claims of thing.

Claims (17)

1. the method for the message transmission of a mobile radio station that utilizes a selection of transfer resource control turnover, this method is used for the base station of a data packet radio communication system, wherein the transmission of the uplink and downlink between mobile radio station and base station all is segmented into radio blocks, and, said method comprising the steps of by single transfer resource in some mobile radio station sharing base:
Specify some radio blocks that can send in succession by this mobile radio station at a special time for selected mobile radio station;
At described special time, in downlink transfer, send the instruction of the radio blocks of a specified number of permission transmission to selected mobile radio station from described base station;
Receive the radio blocks that is transmitted from selected mobile radio station; And
In selected mobile radio station transmission radio blocks, stop other mobile radio stations to utilize transfer resource to transmit, finished up to selected mobile radio station till the transmission of radio blocks of specified number.
2. according to the method for claim 1, it is characterized in that the step of the some radio blocks of described appointment comprises to channel assignment message that comprises the radio blocks of specified number of selected mobile radio station transmission.
3. according to the method for claim 2, it is characterized in that, other mobile radio stations of described prevention utilize the step of transmission resources for transmitting to be included in during the selected mobile radio station transmission radio blocks, send at least one untapped uplink state sign (USF) by described base station and give other mobile radio stations, described untapped USF stops other mobile radio stations to utilize transfer resource to transmit, and has finished up to the mobile radio station of described selection till the transmission of radio blocks of specified number.
4. according to the method for claim 1, it is characterized in that the step of the some radio blocks of described appointment comprises broadcast that comprises the radio blocks of specified number of broadcasting.
5. according to the method for claim 1, it is characterized in that, the step of a permission of the step of the some radio blocks of described appointment and described transmission transfer instruction is to carry out in a single step, this step is included in a uplink state sign (USF) that is addressed to selected mobile radio station in the downlink transfer from the base station to selected mobile radio station transmission, this USF indicates can be at the number of the radio blocks of described special time transmission, and the mobile radio station that is issued to described selection removes to transmit the radio blocks of specified number according to the USF that receives.
6. according to the method for claim 1, it is characterized in that, described base station has an array antenna, be used at least one grouping that transmits and receive data at a plurality of antenna lobes, and described method is further comprising the steps of: receive the some radio blocks by selected mobile radio station transmission in first antenna lobe, simultaneously packet is sent to another mobile radio station of the antenna lobe that is arranged in second non-interference.
7. one kind from the mobile radio station the selected method to control base station transmits information, this method is used for the mobile radio station of a packet radio communication system, wherein the transmission of the uplink and downlink between mobile radio station and base station all is segmented into radio blocks, and, said method comprising the steps of by single transfer resource in some mobile radio station sharing base:
From the indication of described control base station reception more than a number purpose radio blocks;
Receive the instruction of the radio blocks of a specified number of permission transmission from described control base station; And
Respond the instruction of the permission transmission of receiving, transmit the radio blocks of specified number.
8. according to the method for claim 7, it is characterized in that the step of the radio blocks that described reception specifies number comprises from channel assignment message that comprises specified number radio blocks of described base station reception.
9. according to the method for claim 8, it is characterized in that, further comprising the steps of: as when selected mobile radio station is transmitting the radio blocks of specified number, to ignore any untapped uplink state sign (USF) that receives from the base station by selected mobile radio station.
10. according to the method for claim 7, it is characterized in that the step of the radio blocks that described reception specifies number comprises from broadcast that comprises specified number radio blocks of described base station reception.
11. method according to claim 7, it is characterized in that, the step of a permission of the step of the indication of the radio blocks of a plurality of numbers of described reception and described reception transfer instruction is to carry out in a single step, this step is included in a uplink state sign (USF) that is addressed to selected mobile radio station in the downlink transfer from the base station reception, this USF indicates the radio blocks of described number, and the mobile radio station that is issued to described selection transmits the radio blocks of specified number according to the USF that receives.
12. the method according to claim 11 is characterized in that, and is after the radio blocks that transmits specified number, further comprising the steps of:
Determine that by selected mobile radio station downlink transfer in succession is to comprise a untapped USF, still comprise and be addressed to selected mobile radio station and transmit an extra USF of the radio blocks of specified number to specify this mobile radio station;
If downlink transfer in succession comprises untapped USF, then stop transfer of data; And
If downlink transfer in succession comprises and is addressed to selected mobile radio station and transmits the extra USF of the radio blocks of specified number to specify this mobile radio station, then transmit the radio blocks of specified number.
13. mobile radio station, be used for sending and receive the data that are segmented into radio blocks in the data packet radio communication system, described system comprises the uplink and downlink radio channel, and wherein each uplink and downlink radio channel all can be shared by several mobile radio stations, and described mobile radio station comprises:
Be used to receive the instruction of a permission transmission and, it is characterized in that this mobile radio station also comprises the device of its decoding:
Be used to receive the X number data block designator and to the device of its decoding; With
The grant instruction that received of response and transmit the device of the data block of described X number.
14. the mobile radio station according to claim 13 is characterized in that, the device of grant instruction decoding is arranged to the uplink state sign (USF) in the downgoing line radio blocks build is decoded.
15. the mobile radio station according to claim 14 is characterized in that, the device of X number decoding is arranged to a physical channel assignment messages that comprises this X number is decoded.
16. the mobile radio station according to claim 14 is characterized in that, the device of X number decoding is arranged to a broadcast that comprises this X number is decoded.
17. the mobile radio station according to claim 14 is characterized in that, the device of X number decoding is arranged to the USF sign that comprises this X number is decoded.
CN2007100936064A 1998-02-13 1999-01-29 Method for variable block scheduling indication by an uplink state flag in a packet data communication system Expired - Lifetime CN101043458B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US7468898P 1998-02-13 1998-02-13
US60/074688 1998-02-13
US09/201777 1998-12-01
US09/201,777 US6501745B1 (en) 1998-02-13 1998-12-01 Method for variable block scheduling indication by an uplink state flag in a packet data communication system

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