CN101562863A - Method and device for relay selection - Google Patents
Method and device for relay selection Download PDFInfo
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- CN101562863A CN101562863A CNA2009100851987A CN200910085198A CN101562863A CN 101562863 A CN101562863 A CN 101562863A CN A2009100851987 A CNA2009100851987 A CN A2009100851987A CN 200910085198 A CN200910085198 A CN 200910085198A CN 101562863 A CN101562863 A CN 101562863A
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Abstract
The invention discloses a method for relay selection. The method comprises the following steps that a target node d determines to enter a relay mode; a relay node sj figures out reachable rate, compares the reachable rate with target rate, determines a source node set Tj that the relay node sj can help, and feeds the set back to the target node d; the target node d figures out the potential NT#-(i) of the Tj, determines a relay node set Ri which can help a source node si according to the Tj, and figures out the potential NR#-(i) of the Ri; the target node d figures out the priority ci of the source node si; a relay node s lambda is assigned to a source node sk; and the target node d broadcasts the assignment situation of a relay node sj. The invention also discloses a device for relay selection. The device comprises a unit for determining to enter the relay mode, a unit for determining the Tj and the Ri, a unit for calculating the NT#-(j) and the NR#-(i), a unit for calculating the ci, a unit for assigning the relay nodes, and a unit for broadcasting the assignment situation of the relay nodes. The proposal of the invention can obtain excellent outage probability, fairness and capacity performance at a low cost.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of method and device of relay selection.
Background technology
OFDMA (Orthogonal Frequency Division Multiple Access, OFDM), MIMO (Multiple Input Multiple Output, multiple-input and multiple-output) though waits the use of some key technologies can promote spectrum efficiency to a certain extent and eliminate channel impairments, but under the legacy cellular planar network architecture, densely populated areas particularly, the 4th third-generation mobile communication two-forty, the requirement of spectral efficient and ubiquitous covering still is difficult to accomplished.For increasing the base station, the introducing of communication for coordination can promote capacity originally with lower one-tenth, enlarged to cover and the raising reliability.
Communication for coordination can effectively promote network performance, but its performance gain height depends on the selection of via node.Divide according to the relaying number of selecting, relay selection is divided into two classes, many relay selection and single relay selection.A former main cooperative approach that is based on STC (Space-Time Coded, distributed Space Time Coding) of using; The latter can obtain the diversity-multiplexing trade off performance identical with distributed STC cooperative approach, and does not need complicated STC design.Divide according to the relay selection mode, relay selection is divided into centralized and distributed two kinds.Though the former excellent performance needs huge information interaction, expense is excessive; Though latter's expense is very little, under multi-user's scene, be difficult to realize, cause bigger performance loss easily.
The relay selection method that is used for the multi-user collaborative wireless network at present is with centralized in the majority, as, based on Min-Max (minimum-maximum) method, PF (Proportional Fairness, direct ratio justice) method and RR (Round-Robin, poll) method.Above method all is that existing methods is used again, does not take the characteristics of contract network into consideration, and need return all channel condition information to destination node, and expense is huge, is difficult to realize in practice.
Summary of the invention
The embodiment of the invention provides a kind of method and device of relay selection, to obtain excellent outage probability, fairness and volumetric properties with less expense.
The embodiment of the invention provides a kind of method of relay selection, comprising: destination node d is according to source node s
iAnd the channel condition information between the destination node d
Determine and enter repeater mode; Via node s
jAccording to source node s
iAnd the channel condition information between the destination node d
Source node s
iWith via node s
jBetween channel condition information
Via node s
jAnd the channel condition information between the destination node d
Calculate achievable rate, and itself and targeted rate are compared, determine via node s
jThe source node set T that can help
j, it is fed back to destination node d; Destination node d is according to T
jCalculate T
jGesture
According to T
jDetermine and to help source node s
iVia node set R
i, and according to R
iCalculate R
iGesture
Destination node d basis
With
Calculate source node s
iPriority c
iPriority and the via node set that can help each source node according to each source node are source node s
kDistribute via node s
λDestination node d broadcasting via node s
jDistribution condition.
The embodiment of the invention provides a kind of device of relay selection, comprising: judge to enter the repeater mode unit, be used for destination node d according to source node s
iAnd the channel condition information between the destination node d
Determine and enter repeater mode; Judge T
jAnd R
iThe unit is used for determining via node s under repeater mode
jThe source node set T that can help
j, it is fed back to destination node d, destination node is according to T
jDetermine and to help source node s
iVia node set R
iCalculate
With
The unit is used for destination node d according to T
jCalculate T
jGesture
According to R
iCalculate R
iGesture
Calculate c
iThe unit is used for destination node d basis
With
Calculate source node s
iPriority c
iDistribute the via node unit, be used for priority and the via node set that can help each source node, be source node s according to each source node
kDistribute via node s
λBroadcasting via node distribution condition unit is used for destination node d broadcasting via node s
jDistribution condition.
The embodiment of the invention provides a kind of half distributed relay selection method, is optimization aim with the outage probability, compares with existing scheme, can obtain a reasonable compromise between performance and expense when guaranteeing fairness and improving capacity.
Description of drawings
Fig. 1 is the method for relay selection in the embodiment of the invention;
Fig. 2 is source node s in the embodiment of the invention
kDistribute via node s
λMethod;
Fig. 3 is the device of relay selection in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of method of relay selection.
As shown in Figure 1, the method for relay selection mainly comprises the steps:
As shown in Figure 2, be source node s
kDistribute via node s
λMethod mainly comprise the steps:
The embodiment of the invention provides a kind of device of relay selection.
As shown in Figure 3, the device of relay selection comprises: judge to enter repeater mode unit 31, judgement T
jUnit 32, calculating
With
Unit 33, calculating c
iUnit 34, distribution via node unit 35, broadcasting via node distribution condition unit 36.
Judge to enter repeater mode unit 31, be used for destination node d according to source node s
iAnd the channel condition information between the destination node d
Determine and enter repeater mode.
Judge T
jAnd R
iUnit 32 is used for determining via node s under repeater mode
jThe source node set T that can help
j, it is fed back to destination node d, destination node is according to T
jDetermine and to help source node s
iVia node set R
i
Calculate
With
Unit 33 is used for destination node d according to T
jCalculate T
jGesture
According to R
iCalculate R
iGesture
Calculate c
iUnit 34 is used for destination node d basis
With
Calculate source node s
iPriority c
i
Distribute via node unit 35, be used for priority and the via node set that can help each source node, be source node s according to each source node
kDistribute via node s
λ
Broadcasting via node distribution condition unit 36 is used for destination node d broadcasting via node s
jDistribution condition.
The embodiment of the invention provides a kind of half distributed formula relay selection method, is optimization aim with the outage probability, and can guarantees fairness and the raising capacity.Also between performance and expense, obtain a reasonable compromise simultaneously.When using special-purpose via node, when perhaps a via node can help the multiple source node for data forwarding, the relay selection method that the embodiment of the invention is described stood good.
Obviously, those skilled in the art can carry out various changes and modification to the embodiment of the invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1, a kind of method of relay selection is characterized in that, comprising:
Destination node d is according to source node s
iAnd the channel condition information between the destination node d
Determine and enter repeater mode;
Via node s
jAccording to source node s
iAnd the channel condition information between the destination node d
Source node s
iWith via node s
jBetween channel condition information
Via node s
jAnd the channel condition information between the destination node d
Calculate achievable rate, and itself and targeted rate are compared, determine via node s
jThe source node set T that can help
j, it is fed back to destination node d;
Destination node d is according to T
jCalculate T
jGesture
According to T
jDetermine and to help source node s
iVia node set R
i, and according to R
iCalculate R
iGesture
Priority and the via node set that can help each source node according to each source node are source node s
kDistribute via node s
λ
Destination node d broadcasting via node s
jDistribution condition.
2, the method for claim 1 is characterized in that, M source node arranged, and each source node can become the via node of other source nodes, and the note source node set is combined into W={s
1, s
2..., s
M.
3, the method for claim 1 is characterized in that, source node s
iTo destination node d, via node s
jThe training sequence signal of broadcast request communication, destination node d, via node s
jEstimate source node s according to the training sequence signal of receiving respectively
iAnd the channel condition information between the destination node d
Source node s
iWith via node s
jBetween channel condition information
I=1,2 ..., M, j=1,2 ..., M.
4, the method for claim 1 is characterized in that, judges
Whether satisfy targeted rate;
If, then entering the pattern of direct transferring, destination node d is to source node s
i, via node s
jThe broadcasting ack signal, i=1,2 ..., M, j=1,2 ..., M;
If not, then enter repeater mode, destination node d is to source node s
i, via node s
jBroadcasting NACK signal, i=1,2 ..., M, j=1,2 ..., M.
5, method as claimed in claim 4 is characterized in that, under the repeater mode, and via node s
jNACK signal according to receiving estimates via node s
jAnd the channel condition information between the destination node d
Source node s according to the NACK signal extraction of receiving
iAnd the channel condition information between the destination node d
I=1,2 ..., M, j=1,2 ..., M.
6, the method for claim 1 is characterized in that,
ζ is the positive integer that is used for regulating outage probability and fairness, P
Out, iBe source node s
iOutage probability, i=1,2 ..., M.
7, the method for claim 1 is characterized in that,
8, the method for claim 1 is characterized in that, is source node s
kDistribute via node s
λAfter, with s
kShift out W and T
j, with s
λShift out R
i, i=1,2 ..., M, j=1,2 ..., M judges whether W is empty;
If then finish relay selection, destination node d broadcasting via node s
jDistribution condition;
9, a kind of device of relay selection is characterized in that, comprising:
Judge to enter the repeater mode unit, be used for destination node d according to source node s
iAnd the channel condition information between the destination node d
Determine and enter repeater mode;
Judge T
jAnd R
iThe unit is used for determining via node s under repeater mode
jThe source node set T that can help
j, it is fed back to destination node d, destination node is according to T
jDetermine and to help source node s
iVia node set R
i
Calculate
With
The unit is used for destination node d according to T
jCalculate T
jGesture
According to R
iCalculate R
iGesture
Calculate c
iThe unit is used for destination node d basis
With
Calculate source node s
iPriority c
i
Distribute the via node unit, be used for priority and the via node set that can help each source node, be source node s according to each source node
kDistribute via node s
λ
Broadcasting via node distribution condition unit is used for destination node d broadcasting via node s
jDistribution condition.
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CNA2009100851987A CN101562863A (en) | 2009-06-04 | 2009-06-04 | Method and device for relay selection |
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CNA2009100851987A CN101562863A (en) | 2009-06-04 | 2009-06-04 | Method and device for relay selection |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102545992A (en) * | 2011-12-21 | 2012-07-04 | 北京邮电大学 | Optimal relay selection and power distribution method of DF (decode-forward) relay system |
WO2012145560A1 (en) * | 2011-04-20 | 2012-10-26 | Qualcomm Atheros, Inc. | Selecting forwarding devices in wireless communication networks |
US8614956B2 (en) | 2011-03-10 | 2013-12-24 | Qualcomm Incorporated | Placement of wireless repeaters in a wireless communication network |
WO2015096072A1 (en) * | 2013-12-25 | 2015-07-02 | 华为技术有限公司 | Method, apparatus and system for establishing cooperative communication |
CN103052132B (en) * | 2011-10-17 | 2017-05-10 | 北京邮电大学 | Multi-hop relay path selection method and system |
CN107959957A (en) * | 2017-11-10 | 2018-04-24 | 江苏省邮电规划设计院有限责任公司 | A kind of relay selection method for realizing LTE network resource fixed direction allocation |
US10200937B2 (en) | 2013-12-25 | 2019-02-05 | Huawei Technologies Co., Ltd | Message broadcast method, base station, and user equipment |
-
2009
- 2009-06-04 CN CNA2009100851987A patent/CN101562863A/en active Pending
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8614956B2 (en) | 2011-03-10 | 2013-12-24 | Qualcomm Incorporated | Placement of wireless repeaters in a wireless communication network |
WO2012145560A1 (en) * | 2011-04-20 | 2012-10-26 | Qualcomm Atheros, Inc. | Selecting forwarding devices in wireless communication networks |
CN103052132B (en) * | 2011-10-17 | 2017-05-10 | 北京邮电大学 | Multi-hop relay path selection method and system |
CN102545992B (en) * | 2011-12-21 | 2014-07-23 | 北京邮电大学 | Optimal relay selection and power distribution method of DF (decode-forward) relay system |
CN102545992A (en) * | 2011-12-21 | 2012-07-04 | 北京邮电大学 | Optimal relay selection and power distribution method of DF (decode-forward) relay system |
WO2015096072A1 (en) * | 2013-12-25 | 2015-07-02 | 华为技术有限公司 | Method, apparatus and system for establishing cooperative communication |
CN105009680A (en) * | 2013-12-25 | 2015-10-28 | 华为技术有限公司 | Method, apparatus and system for establishing cooperative communication |
US9860927B2 (en) | 2013-12-25 | 2018-01-02 | Huawei Technologies Co., Ltd | Method, apparatus, and system for establishing cooperative communication |
US10200937B2 (en) | 2013-12-25 | 2019-02-05 | Huawei Technologies Co., Ltd | Message broadcast method, base station, and user equipment |
CN105009680B (en) * | 2013-12-25 | 2019-04-19 | 华为技术有限公司 | A kind of method, apparatus and system for establishing communication for coordination |
US10674548B2 (en) | 2013-12-25 | 2020-06-02 | Huawei Technologies Co., Ltd. | Method, apparatus, and system for establishing cooperative communication |
CN107959957A (en) * | 2017-11-10 | 2018-04-24 | 江苏省邮电规划设计院有限责任公司 | A kind of relay selection method for realizing LTE network resource fixed direction allocation |
CN107959957B (en) * | 2017-11-10 | 2020-01-14 | 中通服咨询设计研究院有限公司 | Relay selection method for realizing directional distribution of LTE network resources |
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