CN101330372A - Indication method for scheduling authorization resource in long-term developing TDD system - Google Patents
Indication method for scheduling authorization resource in long-term developing TDD system Download PDFInfo
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Abstract
The invention provides an indication method of dispatching authorized resources in a time division duplex system of long term evolution. A base station generates and sends dispatch and authorization information containing the position indication of authorized resource to a terminal. The indication method is characterized in that the position indication of authorized resource comprises resource block range and sub-frame information; and the sub-frame information comprises a sub-frame position or the initial position and the duration of the sub-frame; the total bit length of the sub-frame information is the same as the bit length of the duration in the long term evolution frequency division duplex system authorized resource position indication. The indication method utilizes a RB initial position, a RB final position and the sub-frame information to indicate the uplink or the downlink position of the dispatched and authorized resource, thereby acquiring lower authorization indication signaling overhead, enabling the authorization indication signaling forms of two systems of LET TDD and LTE FDD to be consistent, and meeting the requirement of the system for frequency selective transmission.
Description
Technical field
The present invention relates to the indicating means of a kind of 3GPP of being applied to LTE TDD (time division duplex of third generation collaborative project Long Term Evolution) system call authorization resources, more specifically, relate to the indicating means of scheduling authorization resource in a kind of LTE TDD system.
Background technology
LTE TDD system mainly is made up of terminal, base station and core net referring to Fig. 1.The connection of logic or physics can be arranged between the base station as required, and the network that the base station is formed is called wireless access network (RAN), is responsible for the Access Layer affairs, such as the management of Radio Resource.The Radio Resource of up-downgoing 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 be connected with one or more core net node (CN).Core net is responsible for the Non-Access Stratum affairs, such as charging, location management etc.Terminal be meant can with the equipment of network communication, such as mobile phone or notebook computer etc.Each terminal only is connected to a base station in the network usually on up direction.
In existing LTE TDD system, for the uplink and downlink shared channel, the mode of employing base station scheduling is controlled the uplink and downlink transmission of different terminals, to improve the utilance of channel.The optional frame structure of LTE TDD system (Alternative frame structure) as shown in Figure 2, the optional frame structure of LTE system has determined that the base station must be a uplink and downlink dispatching cycle with field (5ms).A UL/DL (up/descending) switching point can be arranged, but the switching point position can be dynamically to adjust in the cycle with the field according to the load condition of system's uplink and downlink after subframe #1.Fig. 3 is the typical structure of a subframe in the LTE TDD system.In LTE TDD system, with 12 subcarriers as a RB (Resource Block, Resource Block).12 subcarriers that each RB comprises both can be continuous on frequency, also can be discontinuous.Whether RB is according to frequency two types of continued presence PRB (physical radio carrying) and VRB (virtual radio carrying).The resource of subframe of time domain, a RB of frequency domain is minimum scheduling resource piece, is the least resource unit of uplink and downlink scheduling.The base station is according to QoS (the Quality of Service of different business, service quality) come the transmission on shared channel of dispatching uplink and downlink data, and the authorization message of in the several OFDM of beginning (OrthogonalFrequency Division Multiplexing, the OFDM) symbol of some or all descending sub frames, indicating uplink and downlink to dispatch with L1/L2 (1/ layer 2 on layer) control channel.Terminal (UE) judges whether the needs transceive data and how to carry out modulation and encoding and decoding according to the L1/L2 control channel.The indication of uplink and downlink scheduling authorization may be incorporated in the same L1/L2 control channel to be transmitted, and also may separately transmit.
At present, 3GPP does not also provide the scheduling authorization indication signaling form of LTE TDD system, and uplink and downlink scheduling authorization indication certainly all must comprise resource position field, with the position of authorization by direction resource.To the LTE system, resource location need comprise the duration of Resource Block scope, time-domain subframe position and this mandate of frequency domain.In LTE FDD (Long Term Evolution Frequency Division Duplexing (FDD)) system, because scheduling is based on every subframe, and sub-frame of uplink and descending sub frame are man-to-man relations, uplink scheduling authorization indication signaling in certain descending sub frame can be mapped on the specified upstream subframe clearly, therefore, LTE FDD adopts frequency resource block scope and duration to indicate the authorized resource position, and subframe position is determined by the mapping relations of uplink and downlink subframe are implicit.But for LTE TDD system, owing to do not have man-to-man mapping relations usually between the uplink and downlink subframe, so LTE TDD system need increase the subframe position territory and clearly indicates the authorized resource position.Need to prove that 3GPP LTE wishes that in principle LTE FDD adopts identical scheduling authorization indication signaling form with LTE TDD, so the method for this increase field has not only increased signaling consumption, also is difficult to obtain the support of 3GPP LTE simultaneously.
Summary of the invention
The technical problem to be solved in the present invention provides the indicating means of scheduling authorization resource in a kind of LTE TDD system, and this method has lower signaling consumption.
In order to solve the problems of the technologies described above, the invention provides the indicating means of scheduling authorization resource in a kind of tdd systems of Long Term Evolution, the base station generates the scheduling authorization information that comprises the indication of authorization resources position and sends to terminal, it is characterized in that, the indication of described authorization resources position comprises Resource Block scope and sub-frame information, comprise subframe position in the described sub-frame information or comprise subframe starting position and duration, the bit total length of described sub-frame information is the same with the bit length of duration in the indication of Long Term Evolution frequency division duplex system authorization resources position.
Further, said method also can have following characteristics, the resource location of described authorization resources position indication expression upstream or downstream scheduling authorization.
Further, said method also can have following characteristics, and described Resource Block scope comprises starting position and the end position that Resource Block is RB.
Further, said method also can have following characteristics, and described RB is physical radio carrying PRB or virtual radio carrying VRB.
Further, said method also can have following characteristics, and the described duration is represented the number of sub frames that the indication of described authorization resources position continues from described subframe starting position.
Further, said method also can have following characteristics, if described sub-frame information only comprises subframe position, the duration of then described authorization resources position indication is a subframe.
The invention provides the indicating means of scheduling authorization resource in a kind of LTE TDD system, use RB starting position, RB end position and sub-frame information to indicate the resource location of upstream or downstream scheduling authorization, both can obtain lower mandate indication signaling expense, the mandate indication signaling form of LTE TDD and two kinds of systems of LTE FDD is consistent becomes possibility, can satisfy the requirement of system to the frequency selectivity transmission again.RB in the indicating means of the present invention both can be PRB, also can above VRB.
Description of drawings
Fig. 1 is the structure chart of LTE TDD system;
Fig. 2 is the optional frame assumption diagram of LTE TDD system;
Fig. 3 is the exemplary block diagram of a subframe in the LTE TDD system;
Fig. 4 is the flow chart according to the indicating means of scheduling authorization resource in the LTE TDD of the present invention system;
Fig. 5 is the uplink and downlink sub-frame configuration figure of system of the embodiment of the invention;
Fig. 6 is the schematic diagram of the authorization resources indicating structure of the embodiment of the invention; And
Fig. 7 is the schematic diagram of the uplink authorization resource indication of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
The present invention proposes and use RB starting position, RB end position and sub-frame information to indicate the resource location of upstream or downstream scheduling authorization.In order to narrate conveniently, the indication of this authorization resources position is designated as { RB starting position, RB end position, sub-frame information }, the mandate indication signaling form that this and actual capabilities adopt does not have direct corresponding relation.Here said scheduling authorization both can be at certain UE, also can be at one group of UE, and can also be at all UE.The indication of RB starting position is authorized to first RB position of resource, and the RB end position is indicated last RB position.RB both can be PRB, also can above VRB.The distribution of RB must be continuously, and the frequency domain resource that all from the RB starting position to the RB end position can be used for transfer of data all is assigned to this mandate.And sub-frame information comprises the position that subframe position is an authorization resources place upstream or downstream subframe, perhaps comprise subframe starting position and duration, wherein the starting position of subframe is indicated in the subframe starting position, and the described duration is represented the number of sub frames that the indication of described authorization resources position continues from the subframe starting position.The coding rule of subframe position is that system is provided with.
Fig. 4 is the flow chart according to the indicating means of scheduling authorization resource in the LTE TDD of the present invention system.As shown in Figure 4, this indicating means may further comprise the steps:
Step S402, the base station begins wireless resource scheduling;
Step S404, the base station adopts Resource Block scope and sub-frame information to come the resource authorization of terminal is carried out the position indication, generates the scheduling authorization information that comprises the indication of authorization resources position, and scheduling authorization information is sent to terminal;
Wherein, the Resource Block scope comprises the starting position and the end position of Resource Block.
Sub-frame information is the position of authorization resources place upstream or downstream subframe, perhaps subframe position and duration.If sub-frame information only comprises subframe position, then the duration of authorization resources position indication is a subframe.
The information bit total length of time domain of the present invention, promptly the bit total length of sub-frame information equals the bit length of duration in the indication of LTE FDD authorization resources position.
Step S406, terminal receiving scheduling authorization message and therefrom extract authorization resources position indication; And
Step S408, terminal is according to authorization resources position indication carrying out data transmit-receive.
Suppose that the every subframe of LTE TDD system has 12 RB, and when adopting as shown in Figure 5 uplink and downlink sub-frame configuration, promptly #0, #5, #6 are descending, #1-4 is up.The pre-defined uplink authorization indication signaling of simultaneity factor sends in #0 and two subframes of #5, and adopts resource location indication form, i.e. RB starting position 4bit, RB end position 4bit, subframe starting position 1bit, duration 2bit shown in Figure 6.For the subframe starting position of the entrained uplink authorization indication signaling of subframe # 0, " 0 " expression subframe # 3, " 1 " expression subframe # 4; For the subframe starting position of the entrained uplink authorization indication signaling of subframe # 5, the subframe # 1 of the next field of " 0 " expression, the subframe # 2 of the next field of " 1 " expression.The duration value is that n represents to continue n+1 subframe.In certain dispatching cycle, if the base station need be respectively UE1, UE2 and UE3 distribute ascending resource as shown in Figure 7, promptly in field x the RB# 0 to RB# 7 of subframe # 1 are distributed to UE1, and the RB# 8 to RB#10 of subframe # 1 to #4 distributes to UE2, the RB# 3 to RB# 6 of subframe # 2 and #3 distributes to UE3, then the base station indicates as shown in Figure 7 in the subframe # 5 of field #x-1 the uplink authorization position of these 3 UE, gives UE1, UE2, the authorization resources position of UE3 is designated as { 0b0000,0b0111,0b0,0b00}, { 0b1000,0b1010,0b0,0b11}, { 0b0011,0b0110,0b1,0b01}.
In sum, the present invention uses RB starting position, RB end position and sub-frame information to indicate the resource location of upstream or downstream scheduling authorization, both can obtain lower mandate indication signaling expense, can satisfy the requirement of system to the frequency selectivity transmission again.
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 changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1, the indicating means of scheduling authorization resource in a kind of tdd systems of Long Term Evolution, the base station generates the scheduling authorization information that comprises the indication of authorization resources position and sends to terminal, it is characterized in that, the indication of described authorization resources position comprises Resource Block scope and sub-frame information, comprise subframe position in the described sub-frame information or comprise subframe starting position and duration, the bit total length of described sub-frame information is the same with the bit length of duration in the indication of Long Term Evolution frequency division duplex system authorization resources position.
2, the method for claim 1 is characterized in that, the resource location of described authorization resources position indication expression upstream or downstream scheduling authorization.
3, the method for claim 1 is characterized in that, described Resource Block scope comprises starting position and the end position that Resource Block is RB.
4, method as claimed in claim 3 is characterized in that, described RB is physical radio carrying PRB or virtual radio carrying VRB.
5, the method for claim 1 is characterized in that, the described duration is represented the number of sub frames that the indication of described authorization resources position continues from described subframe starting position.
6, the method for claim 1 is characterized in that, if described sub-frame information only comprises subframe position, the duration of then described authorization resources position indication is a subframe.
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