CN103974434A - User scheduling method and system - Google Patents
User scheduling method and system Download PDFInfo
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- CN103974434A CN103974434A CN201310044703.XA CN201310044703A CN103974434A CN 103974434 A CN103974434 A CN 103974434A CN 201310044703 A CN201310044703 A CN 201310044703A CN 103974434 A CN103974434 A CN 103974434A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
Abstract
The invention discloses a user scheduling method which includes: dividing to-be-scheduled users into two categories, determining the scheduling categories of each sub-frame in a scheduling cycle, and for sub-frames used for uplink transmission, scheduling users from uplink users to perform uplink transmission, wherein the channel quality of the first-category users is higher than that of the second-category users; for the sub-frames used for downlink transmission, scheduling users from downlink users to perform downlink transmission; for the sub-frames used for full duplex transmission, scheduling users from the first-category users to perform downlink transmission or scheduling users from the second-category users to perform uplink transmission. The invention further correspondingly discloses a user scheduling system. By modifying the existing user scheduling mechanisms, same-frequency full duplex transmission in a TDD system is achieved, and accordingly the communication efficiency of the TDD system can be increased. In addition, the method and the system are low in interference elimination requirements of base stations.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to a kind of user scheduling method and system.
Background technology
TD SDMA (Time Division-Synchronous Code Division MultipleAccess, TD-SCDMA) communication system and timesharing Long Term Evolution (Time Division Long TermEvolution, TD-LTE) communication system has adopted time division duplex (Time Division Duplexing, TDD) mode, and a radio frames is divided into 10 subframes, as descending sub frame or sub-frame of uplink, mate asymmetric up-downgoing business with sub-frame of uplink number by configuring different descending sub frame numbers.
Along with mobile Internet business amount rapidly increases, the capacity of TDD system and covering problem (especially focus and indoor) become increasingly conspicuous, not only need design more flexibly ascending-descending subframes configuration mechanism with coupling business up-downgoing dynamic characteristic, and need the spectrum efficiency that further improves TDD system to strengthen network capacity.Based on the demand, in Communication System Design of new generation, to introduce lower powered high density community (as a large amount of femto base stations) and promoted frequency repeat utilization ratio, the co-channel full duplex transmission technology based on low power base station obtains the more and more concern of the degree of depth.
So-called co-channel full duplex, main thought is that base station sends downlink data simultaneously and receives upstream data in similar frequency bands and subframe, thereby can promote at double in theory spectrum efficiency.Co-channel full duplex need to configure respectively reception antenna and transmitting antenna at base station end, and the interference that base station need to be caused transmitted signal in the time receiving upward signal is eliminated.Realize at present the interference of 73dB and eliminated, if adopt directive antenna, even can eliminate 113dB and disturb, thereby, the condition that realizes co-channel full duplex transmission in low power base station application scenarios possessed.
Owing to disturbing, elimination is higher to hardware requirement, therefore co-channel full duplex transmission does not generally operate at user side, but the scheme shown in employing Fig. 1 realizes, in Fig. 1, the data of two different user ends are received and dispatched in base station simultaneously, to improve the efficiency of transmission of whole system, concrete, base station sends data to UE1 in same subframe, receives the data that UE2 sends in same subframe.
But, the co-channel full duplex transmission plan shown in Fig. 1 is applied in existing system and can faces following problem:
1, with two users of base station co-channel full duplex transmission, one sends upward signal, another receives downstream signal, the downstream signal that upward signal can receive another user like this causes interference, and existing multi-subscriber dispatching mechanism is unable to estimate two disturbed conditions between user, causes this interference not avoid or to eliminate, thereby can cause another user's downlink data receiving failure, cannot realize co-channel full duplex transmission, affect the communication efficiency of TDD system;
2, in co-channel full duplex system, base station, in receiving up user, sends data to downlink user, and descending like this transmitted signal can cause interference to uplink receiving signal, thereby improves the requirement of base station being disturbed to elimination ability.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of user scheduling method and system, can improve the communication efficiency of TDD system, and disturbs the requirement of elimination ability lower to base station.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of user scheduling method, will treat that dispatched users is divided into two classes: first kind user and Equations of The Second Kind user, wherein, described first kind user's channel quality is arrived higher than the channel quality to described Equations of The Second Kind user in base station, and the method comprises:
The scheduling type of determining each subframe in dispatching cycle, for the subframe for uplink, from up user, dispatched users is carried out uplink; For the subframe for downlink transfer, from downlink user, dispatched users is carried out downlink transfer; For the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink from Equations of The Second Kind user.
Describedly will treat that dispatched users is divided into two classes and comprises:
If treat that the Reference Signal Received Quality RSRQ of dispatched users is greater than predetermined threshold value, described in inciting somebody to action, treat that dispatched users is divided into first kind user; If treat that the RSRQ of dispatched users is not more than predetermined threshold value, described in inciting somebody to action, treat that dispatched users is divided into Equations of The Second Kind user.
In described definite dispatching cycle, the scheduling type of each subframe is:
If the downlink user of descending sub frame current scheduling is first kind user, or the up user of sub-frame of uplink current scheduling is Equations of The Second Kind user, determines that described subframe can be used for full duplex transmission;
According to traffic needs, from the described subframe that can be used for full duplex transmission, select part or all of subframe for full duplex transmission, determine that in dispatching cycle, the descending sub frame except the subframe for full duplex transmission is for downlink transfer, sub-frame of uplink is for uplink.
Described for the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink and is from Equations of The Second Kind user:
For the sub-frame of uplink for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer; For the descending sub frame for full duplex transmission, from Equations of The Second Kind user, dispatched users is entered uplink.
The method also comprises: for the user who is scheduled, according to quality QoS parameter, determine minimum transmit power.
Described dispatched users carries out uplink or downlink transfer is:
Dispatch according to equitable proportion criterion, maximum throughput criterion or channel quality indicator (CQI) index maximal criterion.
A kind of user's dispatching patcher, comprising: sort module, scheduling type determination module and scheduler module; Wherein,
Described sort module, for treating that dispatched users is divided into two classes: first kind user and Equations of The Second Kind user, wherein, described first kind user's channel quality is arrived higher than the channel quality to described Equations of The Second Kind user in base station;
Described scheduling type determination module, for determining the scheduling type of each subframe in dispatching cycle;
Described scheduler module, for the result definite according to scheduling type determination module, for the subframe for uplink, from up user, dispatched users is carried out uplink; For the subframe for downlink transfer, from downlink user, dispatched users is carried out downlink transfer; For the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink from Equations of The Second Kind user.
Described sort module, specifically in the time that the RSRQ of dispatched users is greater than predetermined threshold value, treats that dispatched users is divided into first kind user described in inciting somebody to action; In the time that the RSRQ of dispatched users is not more than predetermined threshold value, described in inciting somebody to action, treat that dispatched users is divided into Equations of The Second Kind user.
Described scheduling type determination module, is first kind user specifically for the downlink user in descending sub frame current scheduling, or, when the up user of sub-frame of uplink current scheduling is Equations of The Second Kind user, determine that described subframe can be used for full duplex transmission; Afterwards, according to traffic needs, from the described subframe that can be used for full duplex transmission, select part or all of subframe for full duplex transmission, determine that in dispatching cycle, the descending sub frame except the subframe for full duplex transmission is for downlink transfer, sub-frame of uplink is for uplink.
Described scheduler module, specifically for the sub-frame of uplink to for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer; To the descending sub frame for full duplex transmission, from Equations of The Second Kind user, dispatched users is entered uplink.
Described scheduler module, also, for according to quality QoS parameter, determines the minimum transmit power to scheduled user.
Described scheduler module, specifically for dispatching according to equitable proportion criterion, maximum throughput criterion or channel quality indicator (CQI) index maximal criterion.
User scheduling method of the present invention and system, to treat that dispatched users is divided into two classes: first kind user and Equations of The Second Kind user, wherein, described first kind user's channel quality is arrived higher than the channel quality to described Equations of The Second Kind user in base station, determine the scheduling type of each subframe in dispatching cycle, for the subframe for uplink, from up user, dispatched users is carried out uplink; For the subframe for downlink transfer, from downlink user, dispatched users is carried out downlink transfer; For the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink from Equations of The Second Kind user.The present invention is by improving existing user's scheduling mechanism, co-channel full duplex transmission can be in TDD system, realized, thereby the communication efficiency of TDD system can be improved, and, the present invention has reduced the interference between scheduled user, thereby has reduced the requirement of base station being disturbed to elimination ability.
Brief description of the drawings
Fig. 1 is a co-channel full duplex transmission schematic diagram;
Fig. 2 is a kind of user scheduling method schematic flow sheet of the embodiment of the present invention;
Fig. 3 is the frame structure schematic diagram that the embodiment of the present invention adopts LTE sub-frame configuration 1;
Fig. 4 is a kind of user's dispatching patcher of embodiment of the present invention structural representation.
Embodiment
Basic thought of the present invention is: will treat that dispatched users is divided into two classes: first kind user and Equations of The Second Kind user, wherein, described first kind user's channel quality is arrived higher than the channel quality to described Equations of The Second Kind user in base station, determine the scheduling type of each subframe in dispatching cycle, for the subframe for uplink, from up user, dispatched users is carried out uplink; For the subframe for downlink transfer, from downlink user, dispatched users is carried out downlink transfer; For the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink from Equations of The Second Kind user.
The embodiment of the present invention has proposed a kind of user scheduling method, and as shown in Figure 2, the method comprises:
Step 201: will treat that dispatched users is divided into two classes: first kind user and Equations of The Second Kind user, wherein, described first kind user's channel quality is arrived higher than the channel quality to described Equations of The Second Kind user in base station.
Here, the general default setting co-channel full duplex of system transmission cycle, comprises N subframe this dispatching cycle, N=1,2,3 ...Within dispatching cycle, user is divided into two classes: first kind user and Equations of The Second Kind user.Wherein, base station is better to first kind user's channel quality, and base station is poor to Equations of The Second Kind user's channel quality.
Optionally, if treat that the Reference Signal Received Quality (Reference Signal ReceivedQuality, RSRQ) of dispatched users is greater than predetermined threshold value, described in inciting somebody to action, treat that dispatched users is divided into first kind user; If treat that the RSRQ of dispatched users is not more than predetermined threshold value, described in inciting somebody to action, treat that dispatched users is divided into Equations of The Second Kind user.In existing application, all users to be scheduled can send to base station SRS signal, and RSRQ measurement, according to the SRS signal receiving, just can be carried out in base station.
Step 202: determine the scheduling type of each subframe in dispatching cycle, for the subframe for uplink, dispatched users is carried out uplink from up user; For the subframe for downlink transfer, from downlink user, dispatched users is carried out downlink transfer; For the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink from Equations of The Second Kind user.
For example, select K subframe for full duplex transmission from N subframe, in all the other N-K subframe, T subframe is only for uplink, and L subframe, only for downlink transfer, meets T+L=N-K.
It should be noted that, in full duplex subframe, descendingly only dispatch first kind user, uply only dispatch Equations of The Second Kind user.
Based on existing TD-LTE frame structure, according to traffic carrying capacity and whether meet full duplex transmission condition, determine that whether this subframe is for full duplex transmission.Optionally, in described definite dispatching cycle, the scheduling type of each subframe is:
If the downlink user of descending sub frame current scheduling is first kind user, or the up user of sub-frame of uplink current scheduling is Equations of The Second Kind user, determines that described subframe can be used for full duplex transmission;
According to traffic needs, from the described subframe that can be used for full duplex transmission, select part or all of subframe for full duplex transmission, determine that in dispatching cycle, the descending sub frame except the subframe for full duplex transmission is for downlink transfer, sub-frame of uplink is for uplink.
Figure 3 shows that the frame structure schematic diagram that adopts LTE sub-frame configuration 1, as shown in Figure 3, subframe 0, subframe 5 are descending sub frame, subframe 2, subframe 2, subframe 4, subframe 7, subframe 8, subframe 9 are sub-frame of uplink, so, if the downlink user that subframe 0 is dispatched is Equations of The Second Kind user, subframe 0 is not used in full duplex transmission; If the downlink user that subframe 5 is dispatched is first kind user, subframe 5 can be used for full duplex transmission; If the up user that subframe 2 is dispatched is first kind user, subframe 2 is not used in full duplex transmission; If the up user that subframe 3 is dispatched is Equations of The Second Kind user, subframe 3 can be used for full duplex transmission.
Optionally, described for the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink and is from Equations of The Second Kind user:
For the sub-frame of uplink for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer; For the descending sub frame for full duplex transmission, from Equations of The Second Kind user, dispatched users is entered uplink.
Optionally, the method also comprises: for the user who is scheduled, according to QoS (Quality ofService, QoS) parameter, determine minimum transmit power.Concrete, definition QoS threshold, if the user who is scheduled, its QoS is greater than threshold, can suitably reduce transmitted power, only needs to meet QoS demand.
Optionally, described dispatched users is carried out uplink or downlink transfer is:
Dispatch according to equitable proportion criterion, maximum throughput criterion or channel quality instruction (Channel QualityIndicator, CQI) index maximal criterion.Such as according to CQI index maximal criterion, be UE by measuring, by the Signal to Interference plus Noise Ratio calculating according to the corresponding relation of CQI, obtain the index value of CQI.CQI index value is larger, illustrates that its signal quality is better.
Concrete:
If subframe is for uplink, a up user, according to the criterion of equitable proportion rule or maximum throughput or CQI index maximum, is dispatched in base station;
If subframe is for downlink transfer, a downlink user, according to the criterion of equitable proportion rule or maximum throughput or CQI index maximum, is dispatched in base station;
If subframe is for full duplex transmission, up user and the downlink user of pairing, according to the criterion of equitable proportion rule or maximum throughput or CQI index maximum, dispatched in base station.
The embodiment of the present invention has also correspondingly proposed a kind of user's dispatching patcher, and as shown in Figure 4, this system comprises: sort module 41, scheduling type determination module 42 and scheduler module 43; Wherein,
Sort module 41, for treating that dispatched users is divided into two classes: first kind user and Equations of The Second Kind user, wherein, described first kind user's channel quality is arrived higher than the channel quality to described Equations of The Second Kind user in base station;
Scheduling type determination module 42, for determining the scheduling type of each subframe in dispatching cycle;
Scheduler module 43, for the result definite according to scheduling type determination module 42, for the subframe for uplink, from up user, dispatched users is carried out uplink; For the subframe for downlink transfer, from downlink user, dispatched users is carried out downlink transfer; For the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink from Equations of The Second Kind user.
Optionally, sort module 41, specifically in the time that the RSRQ of dispatched users is greater than predetermined threshold value, treats that dispatched users is divided into first kind user described in inciting somebody to action; In the time that the RSRQ of dispatched users is not more than predetermined threshold value, described in inciting somebody to action, treat that dispatched users is divided into Equations of The Second Kind user.
Optionally, scheduling type determination module 42, is first kind user specifically for the downlink user in descending sub frame current scheduling, or, when the up user of sub-frame of uplink current scheduling is Equations of The Second Kind user, determine that described subframe can be used for full duplex transmission; Afterwards, according to traffic needs, from the described subframe that can be used for full duplex transmission, select part or all of subframe for full duplex transmission, determine that in dispatching cycle, the descending sub frame except the subframe for full duplex transmission is for downlink transfer, sub-frame of uplink is for uplink.
Optionally, scheduler module 43, specifically for the sub-frame of uplink to for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer; To the descending sub frame for full duplex transmission, from Equations of The Second Kind user, dispatched users is entered uplink.
Optionally, scheduler module 43, also, for according to quality QoS parameter, determines the minimum transmit power to scheduled user.
Optionally, scheduler module 43, specifically for dispatching according to equitable proportion criterion, maximum throughput criterion or channel quality indicator (CQI) index maximal criterion.
The present invention is by only dispatching first kind user and uply only dispatch Equations of The Second Kind user full duplex subframe being descending, and the signal that can reduce up user receives the interference strength of signal to downlink user, ensure the normal operation of full duplex transmission; And, by only dispatching first kind user full duplex subframe is descending, can reduce base station end transmitted signal interference strength to received signal, thereby reduce the requirement of base station being disturbed to elimination ability, expand base station end and disturbed the range of application of eliminating system limited in one's ability.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (12)
1. a user scheduling method, is characterized in that, will treat that dispatched users is divided into two classes: first kind user and Equations of The Second Kind user, and wherein, described first kind user's channel quality is arrived higher than the channel quality to described Equations of The Second Kind user in base station, and the method comprises:
The scheduling type of determining each subframe in dispatching cycle, for the subframe for uplink, from up user, dispatched users is carried out uplink; For the subframe for downlink transfer, from downlink user, dispatched users is carried out downlink transfer; For the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink from Equations of The Second Kind user.
2. method according to claim 1, is characterized in that, describedly will treat that dispatched users is divided into two classes and comprises:
If treat that the Reference Signal Received Quality RSRQ of dispatched users is greater than predetermined threshold value, described in inciting somebody to action, treat that dispatched users is divided into first kind user; If treat that the RSRQ of dispatched users is not more than predetermined threshold value, described in inciting somebody to action, treat that dispatched users is divided into Equations of The Second Kind user.
3. method according to claim 1, is characterized in that, in described definite dispatching cycle, the scheduling type of each subframe is:
If the downlink user of descending sub frame current scheduling is first kind user, or the up user of sub-frame of uplink current scheduling is Equations of The Second Kind user, determines that described subframe can be used for full duplex transmission;
According to traffic needs, from the described subframe that can be used for full duplex transmission, select part or all of subframe for full duplex transmission, determine that in dispatching cycle, the descending sub frame except the subframe for full duplex transmission is for downlink transfer, sub-frame of uplink is for uplink.
4. method according to claim 3, is characterized in that, described for the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink and is from Equations of The Second Kind user:
For the sub-frame of uplink for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer; For the descending sub frame for full duplex transmission, from Equations of The Second Kind user, dispatched users is entered uplink.
5. according to the method described in claim 1 to 4 any one, it is characterized in that, the method also comprises: for the user who is scheduled, according to quality QoS parameter, determine minimum transmit power.
6. according to the method described in claim 1 to 4 any one, it is characterized in that, described dispatched users carries out uplink or downlink transfer is:
Dispatch according to equitable proportion criterion, maximum throughput criterion or channel quality indicator (CQI) index maximal criterion.
7. user's dispatching patcher, is characterized in that, this system comprises: sort module, scheduling type determination module and scheduler module; Wherein,
Described sort module, for treating that dispatched users is divided into two classes: first kind user and Equations of The Second Kind user, wherein, described first kind user's channel quality is arrived higher than the channel quality to described Equations of The Second Kind user in base station;
Described scheduling type determination module, for determining the scheduling type of each subframe in dispatching cycle;
Described scheduler module, for the result definite according to scheduling type determination module, for the subframe for uplink, from up user, dispatched users is carried out uplink; For the subframe for downlink transfer, from downlink user, dispatched users is carried out downlink transfer; For the subframe for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer, or dispatched users is entered uplink from Equations of The Second Kind user.
8. system according to claim 7, is characterized in that,
Described sort module, specifically in the time that the RSRQ of dispatched users is greater than predetermined threshold value, treats that dispatched users is divided into first kind user described in inciting somebody to action; In the time that the RSRQ of dispatched users is not more than predetermined threshold value, described in inciting somebody to action, treat that dispatched users is divided into Equations of The Second Kind user.
9. system according to claim 7, is characterized in that,
Described scheduling type determination module, is first kind user specifically for the downlink user in descending sub frame current scheduling, or, when the up user of sub-frame of uplink current scheduling is Equations of The Second Kind user, determine that described subframe can be used for full duplex transmission; Afterwards, according to traffic needs, from the described subframe that can be used for full duplex transmission, select part or all of subframe for full duplex transmission, determine that in dispatching cycle, the descending sub frame except the subframe for full duplex transmission is for downlink transfer, sub-frame of uplink is for uplink.
10. system according to claim 9, is characterized in that,
Described scheduler module, specifically for the sub-frame of uplink to for full duplex transmission, from first kind user, dispatched users is carried out downlink transfer; To the descending sub frame for full duplex transmission, from Equations of The Second Kind user, dispatched users is entered uplink.
11. according to the system described in claim 7 to 10 any one, it is characterized in that,
Described scheduler module, also, for according to quality QoS parameter, determines the minimum transmit power to scheduled user.
12. according to the system described in claim 7 to 10 any one, it is characterized in that,
Described scheduler module, specifically for dispatching according to equitable proportion criterion, maximum throughput criterion or channel quality indicator (CQI) index maximal criterion.
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| Publication number | Publication date |
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| WO2014117730A1 (en) | 2014-08-07 |
| CN103974434B (en) | 2017-09-15 |
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