CN101127719B - Indication method for wireless resource allocation of LTE system - Google Patents
Indication method for wireless resource allocation of LTE system Download PDFInfo
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- CN101127719B CN101127719B CN200710151702XA CN200710151702A CN101127719B CN 101127719 B CN101127719 B CN 101127719B CN 200710151702X A CN200710151702X A CN 200710151702XA CN 200710151702 A CN200710151702 A CN 200710151702A CN 101127719 B CN101127719 B CN 101127719B
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Abstract
The utility model discloses an indication method for wireless resource allocation in a LTE system, comprising: a base station informs a terminal the system bandwidth and sends the dispatch/control instruction containing allocation domain of the resource block to the terminal. The terminal knows the resource block allocated on the basis of the system bandwidth and the resource block allocation domain in the dispatch/control instruction. The indication method in the utility model can decide the RB resource to be allocated to the terminal by making the terminal get the system bandwidth and the RB allocation domain in the dispatch/control instruction from the network side, so that the dispatching expense is greatly reduced.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of indicating means of the allocation of radio resources for long evolving system.
Background technology
As shown in Figure 1, third generation affiliate's Long Term Evolution (3GPP LTE) system mainly is comprised of terminal, base station and core net.Wherein, can have as required the connection of logic or physics between the base station, the network that is comprised of the base station is called wireless access network (RAN), and it is responsible for the Access Layer affairs, for example, and the management of Radio Resource; Up and descending Radio Resource is responsible for scheduling by the mode of shared channel by the base station.The base station is connected with core net, and each base station can with is connected or more than one core net node (CN) connects, core net is responsible for the Non-Access Stratum affairs, for example, charging, location management etc.Terminal refer to can with the equipment of network communication, for example, can be mobile phone or notebook computer etc., and each terminal usually only be connected to a base station in the network on up direction.
In existing 3GPP LTE system, for the uplink and downlink shared channel, adopt the mode of base station scheduling to control the uplink and downlink transmission of different terminals, to improve channel utilization.
In 3GPP LTE system, usually with 12 subcarriers as a Resource Block (RB) (RB be up with least unit descending scheduling), and in a subframe, the number of RB is determined by system bandwidth.For example, for the LTE system of 1.25MHz, 2.5MHz, 5MHz, 10MHz and 20MHz system bandwidth, in a subframe, 6RB, 12RB, 25RB, 50RB and 110RB are arranged respectively.The transmission on shared channel of dispatching uplink and downlink data is come according to the service quality (QoS) of different business in the base station, and the authorization message of in the several OFDMs of the beginning of descending sub frame (Orthogonal Frequency Division Multiplexing, OFDM) symbol, indicating uplink and downlink to dispatch with the L1/L2 control channel.Wherein, the structure of typical sub-frame can be as shown in Figure 2 in the 3GPP LTE system.
It is two kinds of scheduling control signalings that transmit in the L1/L2 control channel that uplink scheduling authorization (Uplink Scheduling Grant) signaling and descending scheduling are assigned (Downlink Scheduling Assignment) signaling.The uplink scheduling authorization signaling assigns signaling usually to have different signaling formats with descending scheduling, but these two kinds of scheduling control signalings all comprise the information such as signaling type, modulation coding mode (MCS), RB distribution, HARQ redundancy versions and C-RNTI usually.Terminal (UE) assigns signaling to judge whether the needs transceiving data and how to carry out modulation /demodulation and encoding and decoding according to the scheduling in the subframe.
Fig. 3 shows the form example of scheduling control signaling in the 3GPP LTE system.Wherein, RB distribute to be to be used to indicate which RB in this signaling place subframe and to be assigned to the specified terminal of C-RNTI in this signaling.At present, how carrying out efficiently RB distribution indication is the important content of research.
Because the LTE system of different system bandwidth has different RB numbers in a subframe, therefore, the size of RB allocation domain is relevant with the method for expressing that system bandwidth and RB distribute.Simultaneously, because each bit in the L1/L2 control channel of carrying scheduling resource assignment signalling is very valuable, and the LTE system has been defined in transmission system bandwidth information in the broadcast channel.Therefore, the resource that too much takies in the L1/L2 control channel obviously is disadvantageous.
Yet, the technical scheme that can address the above problem is not yet proposed so far.
Summary of the invention
Consider the problems referred to above and make the present invention that for this reason, main purpose of the present invention is to provide a kind of indication scheme of the allocation of radio resources for long evolving system, to reduce scheduling overhead.
According to embodiments of the invention, provide a kind of indicating means of the allocation of radio resources for long evolving system.
The method comprises: the base station notifies system bandwidth to terminal, and the scheduling control signaling that will comprise the resource block assignments territory sends to terminal; Terminal is known Resource Block to its distribution according to the resource block assignments territory in system bandwidth and the scheduling control signaling.
Wherein, the base station can be in broadcast channel the broadcast system bandwidth.
On the other hand, when carrying out the base station when switching, can comprise following processing: the base station obtains the system bandwidth of the purpose base station of switching the base station, and by switching command the system bandwidth of purpose base station is sent to terminal; After switching to the purpose base station, the dispatch that terminal sends according to the system bandwidth of purpose base station and purpose base station is known the Resource Block to its distribution.
In addition, the Resource Block of terminal distribution comprised: ascending resource piece and/or downlink resource piece.
When to terminal distribution ascending resource piece, adopt tree type representation to represent the ascending resource piece.Afterwards, terminal can parse according to tree type representation starting position and the length in ascending resource piece territory, to determine the ascending resource piece to its distribution.And the ascending resource piece is continuous.
On the other hand, when to terminal distribution downlink resource piece, the downlink resource piece is represented, wherein, the method for expressing of downlink resource piece is comprised: full bitmap method, tree type representation, subset representation and grouping representation.Afterwards, terminal can be according to the definite ascending resource piece to its distribution of method of expression downlink resource piece.And the downlink resource piece is continuous or discontinuous.
The present invention has effectively reduced scheduling overhead by making terminal from network side obtain the RB resource that RB allocation domain in system bandwidth and the scheduling control signaling determines to distribute to terminal.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the block diagram according to the 3GPP LTE system of correlation technique;
Fig. 2 is the schematic diagram according to the structure example of subframe in the 3GPP LTE system of correlation technique;
Fig. 3 is the schematic diagram according to scheduling control signaling form in the 3GPP LTE system of correlation technique;
Fig. 4 is the flow chart according to the indicating means of the allocation of radio resources that is used for the LTE system of the embodiment of the invention;
Fig. 5 is the schematic diagram of the RB allocation domain form in the uplink scheduling authorization signaling of processing example 1 of method of the embodiment of the invention; And
Fig. 6 is the schematic diagram that the descending scheduling of processing example 2 of the method for the embodiment of the invention is assigned the RB allocation domain form of grouping representation in the signaling.
Embodiment
In the present embodiment, a kind of indicating means of the allocation of radio resources for long evolving system is provided, wherein, do not comprise system bandwidth information in scheduling control signaling, terminal is known RB to its distribution according to the system bandwidth that obtains from network side and the RB allocation domain the scheduling control signaling after receiving scheduling control signaling.
Describe below with reference to accompanying drawings the present invention in detail.
Preferably, can come with flow process shown in Figure 4 the indicating means of the allocation of radio resources of executive basis present embodiment.
As shown in Figure 4, comprise according to the indicating means of the allocation of radio resources that is used for long evolving system of present embodiment: step S402, the base station is notified system bandwidth to terminal from network side, and the scheduling control signaling that will comprise the RB allocation domain sends to terminal; And step S404, terminal is known RB to its distribution according to the RB allocation domain in system bandwidth and the scheduling control signaling.
Wherein, the base station can be in broadcast channel the broadcast system bandwidth.
On the other hand, when carrying out the base station when switching, can comprise following processing: this base station (former base station) obtains the system bandwidth of the purpose base station of switching the base station, and by switching command the system bandwidth of purpose base station sent to terminal; After switching to the purpose base station, terminal is known RB to its distribution according to the system bandwidth of purpose base station and the dispatch that sent by the purpose base station afterwards.
In addition, the RB of terminal distribution comprised: up RB and/or descending RB.
When to the up RB of terminal distribution, adopt tree type representation to represent up RB.Afterwards, terminal can parse according to tree type representation starting position and the length in up RB territory, to determine the up RB to its distribution.And up RB is continuous.
On the other hand, when to the descending RB of terminal distribution, descending RB is represented, wherein, the method for expressing of descending RB is comprised: full bitmap method, tree type representation, subset representation and grouping (Grouping) representation.Afterwards, terminal can be according to the definite up RB to its distribution of the method for the descending RB of expression.And descending RB is continuous or discontinuous.
The below will be respectively in conjunction with being described for up and descending different disposal example.
Example 1: for up RB
For the distribution of up RB, the LTE system has determined to adopt tree type method for expressing.In this method for expressing, the RB allocation domain is of a size of
Bits.Wherein N is the RB number of system in a subframe, "
Expression rounds up.Terminal can be known the RB number of system in a subframe according to system bandwidth.If terminal is not known system bandwidth, then after receiving the uplink scheduling authorization signaling, it will not know how to resolve the RB allocation domain, unless in the uplink scheduling authorization signaling, comprise the system bandwidth relevant information.
The LTE system that to suppose that a system bandwidth is arranged be 5MHz, each subframe has 25 RB.Up RB is assigned
Plant possibility, need 9bits to represent this moment, so the RB allocation domain is sized to 9bits.As shown in Figure 5, terminal is that 5MHz can know that this system uplink RB allocation domain is of a size of 9bit according to system in the system bandwidth of broadcast channel.Like this, terminal just can parse RB starting position and the RB length of distributing to it according to tree type representation from the RB allocation domain of 9bit when receiving the uplink scheduling authorization signaling, thereby determines to distribute to its RB.
Example 2: for descending RB
Distribute for descending RB, which type of method for expressing is the LTE system not yet determine to adopt.Because will be supported in the descending scheduling appointment signaling discontinuous descending RB is distributed to same terminal, this expression of distributing for descending RB has brought difficulty.Particularly larger to system bandwidth, for example, the system of 10MHz, 20MHz if each possible distribution condition is all represented, then can bring very large expense.But, for the little system of system bandwidth, for example, 1.25MHz, adopt bitmap represent all distribution may be not only flexibly but also simple.
Therefore, descending RB distributes may exist multiple method for expressing simultaneously, for example, and full bitmap method, tree type representation, subset representation and grouping representation.Even the same method for expressing, to the system of different system bandwidth, the size of descending RB allocation domain also may be different.Therefore, terminal is divided timing at the descending RB of parsing, still needs to know system bandwidth.
Wherein, for the grouping representation, the grouping granularity may exist multiple, for example, 2,3,4 and 5, comprise expression type, grouping granularity and bitmap in the descending RB allocation domain.Wherein, expression type indication is which kind of method for expressing distributes what adopt be to this descending RB.The size of bitmap has grouping granularity and system bandwidth to determine.When adopting the grouping representation, system at first is divided into K group (the RB number of last group may be less than the grouping granularity) with N RB by the grouping granularity.When giving terminal distribution RB, distribute for least unit by group.Simultaneously, adopt the bitmap of K-bits to represent which group to terminal distribution.
The LTE system that to suppose that a system bandwidth is arranged be 10MHz, each subframe has 50 RB.The different distribution condition of descending RB basic of distribution can adopt tree type representation, subset representation and grouping representation.Fig. 6 granularity be 3 grouping representation to have indicated the base station be terminal distribution RB# 0,1,2,9,10,11,47,48 and 49 situation.Terminal receives, and at first knows that according to two bit of the beginning in the RB allocation domain expression type is grouping expression type, knows that according to ensuing two bit the grouping granularity is 3 again, further knows the long 17-bits of bitmap according to system bandwidth.Know the RB that distributes to it according to bitmap afterwards.
In sum, the present invention has effectively reduced scheduling overhead by making terminal from network side obtain the RB resource that RB allocation domain in system bandwidth and the scheduling control signaling determines to distribute to terminal.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. indicating means that is used for the allocation of radio resources of long evolving system, it is characterized in that, comprise: the base station notifies system bandwidth to terminal, and the scheduling control signaling that will comprise the resource block assignments territory sends to described terminal, wherein, the information that does not comprise described system bandwidth in the described scheduling control signaling; Described terminal is known Resource Block to its distribution according to the resource block assignments territory in described system bandwidth and the described scheduling control signaling;
When carrying out the base station switching, comprise following processing:
Described base station obtains the system bandwidth of the purpose base station of switching the base station, and by switching command the system bandwidth of described purpose base station is sent to described terminal;
After switching to described purpose base station, the dispatch that described terminal sends according to the system bandwidth of described purpose base station and described purpose base station is known the Resource Block to its distribution;
When to described terminal distribution downlink resource piece, described downlink resource piece is represented, wherein, method for expressing to described downlink resource piece comprises: full bitmap method, tree type representation, subset representation and grouping representation, for the little system of system bandwidth, utilize the full bitmap method to represent described downlink resource piece, for the large system of system bandwidth, utilize tree type representation or subset representation or grouping representation to represent described downlink resource piece.
2. method according to claim 1 is characterized in that, described system bandwidth is broadcasted in described base station in broadcast channel.
3. method according to claim 1 is characterized in that, the described Resource Block of described terminal distribution is comprised: ascending resource piece and/or downlink resource piece.
4. method according to claim 3 is characterized in that, when to the described ascending resource piece of described terminal distribution, adopts tree type representation to represent described ascending resource piece in the resource block assignments territory in described scheduling control signaling.
5. method according to claim 4 is characterized in that, described terminal parses starting position and the length in described ascending resource piece territory according to described tree type representation, to determine the described ascending resource piece to its distribution.
6. method according to claim 4 is characterized in that, described ascending resource piece is continuous.
7. method according to claim 1 is characterized in that, described terminal is according to the definite described ascending resource piece to its distribution of the method for the described downlink resource piece of expression.
8. method according to claim 1 is characterized in that, described downlink resource piece is continuous or discontinuous.
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| WO2010075678A1 (en) * | 2009-01-04 | 2010-07-08 | Huawei Technologies Co., Ltd. | Method, apparatus and system for signaling resource partition |
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