CN102448133B - Wireless communications method - Google Patents
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- CN102448133B CN102448133B CN201210023967.2A CN201210023967A CN102448133B CN 102448133 B CN102448133 B CN 102448133B CN 201210023967 A CN201210023967 A CN 201210023967A CN 102448133 B CN102448133 B CN 102448133B
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Abstract
A kind of wireless communication system, its object is to cut down the channel radio traffic between relay station and base station, improves communication quality.This wireless communication system comprises: the 1st wireless base station, the 2nd wireless base station carrying out communicating with described 1st wireless base station, carry out the relay station that communicates and mobile radio station via described 1st wireless base station and described 2nd wireless base station, described method comprises following steps: described 2nd wireless base station sends entrusts, and this trust replaces described 2nd wireless base station to communicate with described relay station for entrusting described 1st wireless base station; And on commission described 1st wireless base station replaces described 2nd wireless base station to communicate with described relay station, and result of communication is sent to described 2nd wireless base station.
Description
The application is the applying date is on June 16th, 2009, and application number is 200980159797.7, and denomination of invention is the divisional application of the application for a patent for invention of " wireless communication system ".
Technical field
The present invention relates to wireless communication system.As wireless communication system, such as, comprise mobile communication system.
Background technology
The main way of the mobile communication system such as portable phone is cellular fashion as described below: cover by multiple broad regions comprising the region (community) that can carry out the scope of receiving and dispatching in base station and combine, the base station shifting along with the movement of mobile radio station, thus proceed communication.
Current, the third generation mobile communications mode based on CDMA (CodeDivisionMultipleAccess: code division multiple access) mode has started service, and is studying the next generation mobile communication mode can carrying out more high-speed communication energetically.
On the other hand, in 3GPP (3rdGenerationPartnershipProject: third generation partner program), further at the high-speed wireless services that be called as LTE-advanced of research as its development version.In LTE-advanced, as the characteristic ameliorative way in high-throughput or blind area, expectation will import relay station (relay).
As the structure of relay station, although also can be from its structure existed of mobile radio station None-identified, in 3 gpp, main research be with the structure of the mode work equal with common wireless base station.Now, observe from relay station, be positioned at the upper base station of relay station as router, play a role as just tie point.
As prior art, in the wireless communication system being configured with relay station, propose minimizing signaling amount, reduce the technology (patent documentation 1) of the transmission times of mobile radio station.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2009-81513 publication (numbered paragraphs (0035) ~ (0047), Fig. 1, Fig. 2)
Summary of the invention
Invent problem to be solved
In LTE and LTE-advanced, each base station switches or disturbs control to carry out, and sometimes needs communicating each other.Communication interface between base station is defined as X2 interface.
Figure 17 is the figure that inter-base station interface is shown.Wireless network 5a comprises base station eNB 0 ~ eNB4.In the X2 interface of LTE, connect in a wired fashion between base station.In the drawings, base station eNB 0, via wired transfer path X2-1 ~ X2-4, is connected with base station eNB 1-eNB4 respectively.
In addition, although for convenience of explanation, illustrate only and connect interface to base station eNB 1-eNB4 from base station eNB 0, in fact each base station is connected with other base stations respectively, therefore becomes latticed wiring.
When base station eNB 0 communicates with other base station, wired mode is used to communicate by X2 interface.Such as, if base station eNB 0 communicates with base station eNB 1, then use wired transfer path X2-1, if communicated with base station eNB 2, then use wired transfer path X2-2.
Like this, based on X2 interface base station between communication normally to be undertaken by wired mode, but when existing with the relay station of the mode work equal with base station as mentioned above, wirelessly be connected between relay station with upper base station, therefore in the part interval of X2 interface, include wireless mode.
Figure 18 is the figure that the inter-base station interface that there is relay station is shown.Wireless network 5b comprises: base station eNB 0 ~ eNB4, relay station RN and mobile radio station UE.
Relay station RN carries out the action equal with common base station.In addition, for relay station RN, there is upper base station and (set base station eNB 0 as upper base station.In addition, upper base station is also referred to as Donor), relay station RN is connected by radio propagation path X2-5 with upper base station eNB 0.Mobile radio station UE is there is the subordinate of relay station RN.
When relay station RN communicates with base station eNB 1-eNB4, via upper base station eNB 0, therefore not only to comprise wire communication and also comprise radio communication.Such as, when relay station RN communicates with base station eNB 1, radio propagation path X2-5 and wired transfer path X2-1 be used.
Figure 19 is the figure of the order that switching (handover) is shown.Example when communicating with other base stations as relay station RN, shows the order of switching.In addition, if in wireless network 5b, the mobile radio station UE of relay station RN subordinate performs switching, switch destination candidate and comprise base station eNB 1, eNB2.
Measurement result, when performing switching, along with the mobile incoming level measuring the electric wave sent from the base station of periphery, is included in the signaling being called as MeasurementReport (measurement report) and is sent to relay station RN by (S101) mobile radio station UE.
(S102) relay station RN, when receiving the measurement report of incoming level, identifies and there is base station eNB 1, eNB2 in the switching destination candidate that incoming level is good.HORequest (handover request signaling) is sent to base station eNB 1 by relay station RN at first.HORequest is sent to base station eNB 1 via upper base station eNB 0.
(S103) base station eNB 1 is when receiving HORequest, can the congestion state etc. according to our station judge switch, if can switch, then returns HOOK (switching license signaling), if can not switch, then return HOFail (signaling is forbidden in switching).Here, be set to and can not switch, and return HOFail to relay station RN.HOFail is sent to relay station RN via upper base station eNB 0.
(S104) relay station RN, when receiving the HOFail from base station eNB 1, sends HORequest to the base station eNB 2 of other candidates.HORequest is sent to base station eNB 2 via upper base station eNB 0.
(S105) base station eNB 2 is when receiving HORequest, and can judgement switch.When switching, return HOOK to relay station RN.HOOK is sent to relay station RN via upper base station eNB 0.
Base station eNB 2 is defined as switching destination according to the content of HOOK by (S106) relay station RN, by HOcommand (switching command), this situation is informed to mobile radio station UE.Then, in mobile radio station UE, going out base station eNB 2 according to the content recognition of HOcommand is handover destination base stations, performs switching to base station eNB 2.
Here, when relay station RN communicates with other base stations, carry out radio communication via the radio propagation path X2-5 between relay station RN and upper base station eNB 0, but when consider from other base stations interference or give other base stations bring interference etc. time, wishes minimizing radio propagation path X2-5 on wireless signaling amount.Namely, wish that the exchange times of wireless signaling amount between relay station RN and upper base station eNB 0 or wireless signaling is few.
But, switch described above/order is such, if do not do any consideration to wireless signaling amount and implement to switch, then between relay station RN and upper base station eNB 0, before the base station determining switching destination, needs to exchange wireless signaling continually.
So there are the following problems: the wireless signaling amount of radio propagation path X2-5 increases, rise from the interference of other base stations and the level of the interference of bringing to other base stations, cause communication quality deterioration.In addition, in the case of wireless communication, also there are the following problems: the delay needed for the process such as the foundation of radiolink is large, and therefore when carrying out radio communication continually, processing delay increases.
In addition, in the above description, although be switch to example to be illustrated, in relay station RN and other base stations, for other Control on Communication, also can produce same problem.
The present invention completes in view of the above problems, its object is to, and provides a kind of and cuts down the channel radio traffic between relay station and base station and improve the wireless communication system of communication quality.
For solving the means of problem
In order to solve the problem, provide a kind of wireless communication system.This wireless communication system has: the 1st wireless base station; 2nd wireless base station; And relay station, it is wirelessly connected with above-mentioned 1st wireless base station, and communicates with above-mentioned 2nd wireless base station via above-mentioned 1st wireless base station.
Here, the communication between the 1st wireless base station agency and the 2nd wireless base station entrusted by relay station, and the 1st on commission wireless base station replaces relay station to communicate with the 2nd wireless base station, and result of communication is sent to relay station.
Invention effect
The channel radio traffic between relay station and base station can be cut down, realize the raising of communication quality.
By the following explanation showing the preferred embodiment of the present invention accompanying drawing as an example He be associated, foregoing of the present invention and other objects, feature and advantage can be specified.
Accompanying drawing explanation
Fig. 1 is the figure of the structure example that wireless communication system is shown.
Fig. 2 is the figure of the structure example that relay station is shown.
Fig. 3 is the figure of the structure example that upper base station is shown.
Fig. 4 is the figure that communication sequence is shown.
Fig. 5 is the figure of the structure example that relay station is shown.
Fig. 6 is the figure that communication sequence is shown.
Fig. 7 is the figure of the structure example that upper base station is shown.
Fig. 8 is the figure that communication sequence is shown.
Fig. 9 is the figure of the structure example that wireless communication system is shown.
Figure 10 is the figure that communication sequence is shown.
Figure 11 is the figure of the structure example that relay station is shown.
Figure 12 is the figure of the structure example that upper base station is shown.
Figure 13 is the figure that communication sequence is shown.
Figure 14 is the figure of the structure example that relay station is shown.
Figure 15 is the figure of the structure example that upper base station is shown.
Figure 16 is the figure that communication sequence is shown.
Figure 17 is the figure that inter-base station interface is shown.
Figure 18 is the figure that the inter-base station interface that there is relay station is shown.
Figure 19 is the figure that transfer sequence is shown.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.Fig. 1 is the figure of the structure example that wireless communication system is shown.Wireless communication system 1 has: relay station 10, upper base station (the 1st wireless base station) 20, base station (the 2nd wireless base station) 31,32 and mobile radio station 2.Upper base station 20 is connected with base station 31,32 by wired mode.In addition, relay station 10 is wirelessly connected with upper base station 20, communicates with base station 31,32 via upper base station 20.
Here, relay station 10, when communicating with base station 31,32, entrusts upper base station 20 to act on behalf of the communication with base station 31,32.The upper base station 20 of on commission agent communication replaces relay station 10 to communicate with base station 31,32, result of communication is sent to relay station 10.In addition, when communicating with base station 31,32, upper base station 20 agent communication can be entrusted, also can not entrust and carry out common communication.
Then, structure and the action of relay station 10 in wireless communication system 1 and upper base station 20 is described in detail.Fig. 2 is the figure of the structure example that relay station is shown.Wherein, show the function relevant with the process of control information, eliminate the record of the functions such as data transmit-receive.
Relay station 10 has communication control unit 11 and agency's (Proxy) commissioned portion 12.Communication control unit 11, when receiving the control information of sending from mobile radio station 2, judges whether to carry out commission order to upper base station 20.The information of carrying out commission order is sent to commission order portion 12, and other control informations will carry out the Control on Communication that specifies, thus is sent to mobile radio station 2 or upper base station 20.In addition, communication control unit 11, when receiving the control information of sending from commission order portion 12 or upper base station 20, carries out the Control on Communication that specifies and is sent to mobile radio station 2.
Commission order portion 12, when the control information receiving commission order, generates the proxy requests comprising the content of this information, is sent to upper base station 20.Further, commission order portion 12, when receiving the proxy response of the response message as proxy requests of sending from upper base station 20, is sent to communication control unit 11.
Fig. 3 is the figure of the structure example that upper base station 20 is shown.Wherein, show the function relevant with the process of control information, eliminate the record of the functions such as data transmit-receive.Upper base station 20 has communication control unit 21 and agentbased control portion 22.
When the control information of sending from relay station 10 is for being proxy requests, this information is sent to agentbased control portion 22, and other control information is sent to communication control unit 21.Communication control unit 21, for the control information beyond proxy requests, carries out the Control on Communication specified, and is sent to mobile radio station 2 or other base stations.In addition, communication control unit 21, when receiving the control information of sending from other base stations (network that base station 31,32 etc. are residing), carries out the Control on Communication specified, and is sent to relay station 10.
Agentbased control portion 22 when receiving the proxy requests of sending from relay station 10, and carries out agent processes between other base stations, and the result of sending from other base stations is sent to relay station 10 as proxy response.
Fig. 4 is the figure that communication sequence is shown.Illustrated therein is following order: when relay station 10 communicates with base station 31,32, give upper base station 20 by the commission order of its communication process, the result of communication agent is sent to relay station 10.
ProxyRequest (proxy requests signaling), when communicating with base station 31,32, is sent to upper base station 20 by (S1) relay station 10, asks upper base station 20 to act on behalf of the communication with base station 31,32.
(S2) upper base station 20, when receiving ProxyRequest, goes out will communicate with base station 31,32 according to the content recognition of ProxyRequest.First, Request (demand signalling) is sent to base station 31.
The process specified, when receiving Request, is carried out in (S3) base station 31, by Response (response signaling), its result is informed to upper base station 20.
Base station 32, (S4) 20 pairs, upper base station sends Request.
The process specified, when receiving Request, is carried out in (S5) base station 32, by Response, its result is informed to upper base station 20.
The content of Response, when receiving the Response sent from base station 31,32, is included in ProxyResponse (proxy response signaling), is sent to relay station 10 by (S6) upper base station 20.
As mentioned above, when relay station 10 communicates with base station 31,32, relay station 10 is configured to: give upper base station 20 by the commission order of communication process, upper base station 20 replaces relay station 10 to communicate with base station 31,32, and the result of communication process is sent to relay station 10.Thereby, it is possible to reduce the channel radio traffic between relay station 10 and upper base station 20.
Then, in wireless communication system 1, communication process entrusts to upper base station 20 to carry out situation about acting on behalf of by relay station 10, is described below for concrete Control on Communication.First illustrate that relay station 10 is by the selected control entrusting to upper base station 20 of handover destination base station when the mobile radio station 2 of relay station 10 subordinate performs switching.
Fig. 5 is the figure of the structure example that relay station is shown.In addition, the structure of upper base station 20 is identical with Fig. 3.Relay station 10a has communication control unit 11-1 and commission order portion 12.In addition, communication control unit 11-1 comprises hand-off process portion 11a.
Communication control unit 11-1 is when receiving the MeasurementReport sent from mobile radio station 2, and identifying mobile radio station 2 will switch.The reception level measuring information comprised in MeasurementReport (information that mobile radio station 2 measures the incoming level from the electric wave of peripheral base station transmission and obtains) together with the ID of mobile radio station 2, the set information of mobile radio station 2 etc., is consigned to commission order portion 12 by hand-off process portion 11a.In commission order portion 12, generate the ProxyRequest for asking upper base station 20 to carry out acting on behalf of and be sent to upper base station 20.
On the other hand, in the upper base station 20 of Fig. 3, judge that from the control information of relay station 10a be common information or ProxyRequest, when for ProxyRequest, be sent to agentbased control portion 22, on the other hand, other control information be sent to communication control unit 21.Agentbased control portion 22 is when receiving ProxyRequest, and proxy relay station 10a carries out switching the selected of destination, and the information of determined switching destination is sent to relay station 10a as ProxyResponse.
Fig. 6 is the figure that communication sequence is shown.Show when the mobile radio station 2 of relay station 10a subordinate performs switching, relay station 10a entrusts upper base station 20 to select the order of handover destination base station.
MeasurementReport is sent to relay station 10a when performing and switching by (S11) mobile radio station 2.
(S12) relay station 10a, when receiving MeasurementReport, identifies mobile radio station 2 and will perform switching.Relay station 10a generates ProxyRequest and is sent to upper base station 20, entrusts upper base station 20 to carry out the agency of hand-off process.
In addition, in ProxyRequest, include the state information of mobile radio station 2.As state information, the reception level measuring information etc. that corresponding information has the information relevant with the state of mobile radio station 2 such as mobile radio station ID, transfer rate (context) and comprises from the MeasurementReport that mobile radio station 2 sends.
(S13) upper base station 20, when receiving ProxyRequest, is identified and there is base station 31,32 in the switching destination candidate that incoming level is good.First upper base station 20 sends HORequest to base station 31.
(S14) base station 31, when receiving HORequest, if be judged to switch according to the congestion state etc. of our station, then returns HOFail.
(S15) upper base station 20, when receiving the HOFail corresponding with base station 31, sends HORequest to other candidate base stations 32.
(S16) base station 32 receives HORequest, if be judged as switching, then HOOK is sent to upper base station 20.
Base station 32 is defined as switching destination according to the content of HOOK by (S17) upper base station 20, by ProxyResponse, its result is informed to relay station 10a.
(S18) relay station 10a is when receiving ProxyResponse, and identifying handover destination base station is base station 32, by HOcommand, this situation is informed to mobile radio station 2.
Here, in the past, as shown in figure 19, between relay station and switching destination candidate, before determining handover destination base station, need to exchange wireless signaling continually.In contrast, in above-mentioned switching agentbased control, be configured to: the selected of mobile destination base station, when performing the switching of mobile radio station 2, is entrusted to upper base station 20, accepted its result and inform mobile radio station 2 from upper base station 20 by relay station 10a.
Thus, the wireless signaling between relay station 10a and upper base station 20 is ProxyRequest and ProxyResponse, therefore, it is possible to cut down the channel radio traffic between relay station 10a and upper base station 20.
In addition, in the MeasurementReport from mobile radio station 2, only comprise situation of the reception level measuring information of a base station etc., expect and switch the exchange times of the wireless signaling between the candidate of destination few, also can be judged as not carrying out agentbased control.When relay station 10a is judged as the agency not needing the hand-off process of entrusting upper base station 20 to carry out, relay station 10a can carry out common hand-off process as shown in figure 19.
The control when state informations relevant with mobile radio station 2 such as reception level measuring information being sent to relay station in advance and performing switching is then described.
Fig. 7 is the figure of the structure example that upper base station is shown.In addition, the structure of relay station is identical with Fig. 5.Upper base station 20a has communication control unit 21 and agentbased control portion 22-1.Further, agentbased control portion 22-1 comprises state information storage unit 22a.
The relay station 10a of Fig. 5, when receiving the MeasurementReport from mobile radio station 2, extracts the reception level measuring information comprised in MeasurementReport.Reception level measuring information is included in ProxyRequest and informs to upper base station 20a by commission order portion 12.
On the other hand, when upper base station 20a receives the ProxyRequest sent from relay station 10a, agentbased control portion 22-1 extracts reception level measuring information, and is saved in state information storage unit 22a.Further, based on reception level measuring information, proxy relay station 10a carries out switching the selected of destination, and the information of determined switching destination is sent to relay station 10a as ProxyResponse.
Fig. 8 is the figure that communication sequence is shown.Show the order when reception level measuring information measured by mobile radio station 2 is sent to relay station 10a in advance and performs switching.
Reception level measuring information, by MeasurementReport, is sent to relay station 10a by (S21a) mobile radio station 2.
(S21b) relay station 10a, when receiving MeasurementReport, sends it to upper base station 20a, and upper base station 20a extracts and preserves the reception level measuring information comprised in MeasurementReport.
(S22a) mobile radio station 2 continues mobile, measures the incoming level of base station in new mobile destination.Further, by MeasurementReport, new reception level measuring information is sent to relay station 10a again.
(S22b) relay station 10a, when receiving MeasurementReport, sends it to upper base station 20a, and upper base station 20a extracts and preserves the reception level measuring information comprised in MeasurementReport, realizes the renewal of reception level measuring information.
ProxyRequest is sent to upper base station 20a by (S23) relay station 10a, entrusts upper base station 20a to carry out the agency of hand-off process.Here, owing to not comprising reception level measuring information in this ProxyRequest, therefore compared with the amount of information of the ProxyRequest of above-mentioned step S12, amount of information is less.
(S24) upper base station 20a, according to the reception level measuring information notified by MeasurementReport, is identified and there is base station 31,32 in the switching destination candidate that incoming level is good.Upper base station 20a is when receiving ProxyRequest, and identifying mobile radio station 2 will switch, and HORequest is sent to base station 31.
(S25) base station 31, when receiving HORequest, is judged to switch according to the congestion state etc. of our station, returns HOFail.
(S26) upper base station 20a, when receiving the HOFail corresponding with base station 31, sends HORequest to the base station 32 of other candidates.
(S27) base station 32, when receiving HORequest, is judged as switching, and returns HOOK to upper base station 20a.
Base station 32 is defined as switching destination according to the content of HOOK by (S28) upper base station 20a, by ProxyResponse, its result is informed to relay station 10a.
(S29) relay station 10a is when receiving ProxyResponse, and identifying handover destination base station is base station 32, by HOcommand, this situation is informed to mobile radio station 2.
As mentioned above, the reception level measuring information that the MeasurementReport of the mobile radio station 2 from subordinate notifies is prenoticed to upper base station 20a by relay station 10a, and upper base station 20a preserves the information notified.
Further, when performing the switching of mobile radio station 2, upper base station 20a is entrusted to carry out the agency switched by ProxyRequest.Do not comprise reception level measuring information in ProxyRequest at this moment, therefore, it is possible to cut down channel radio traffic further, upper base station 20a can be entrusted to act on behalf of from relay station 10a with the shorter time, so the processing delay with switching can be reduced.
In addition, in the above description, that the state information relevant with mobile radio station 2 is set to reception level measuring information, and notify reception level measuring information by MeasurementReport in advance, but except reception level measuring information, also the information such as mobile radio station ID, transfer rate can be included in MeasurementReport and notify in advance.Thereby, it is possible to cut down the amount of information of ProxyRequest further.
Then illustrate when including relay station in mobile destination candidate, make the control of the transmission of the upper base station proxy-switching request of this relay station.
Fig. 9 is the figure of the structure example that wireless communication system is shown.Wireless communication system 1a comprises upper base station (the 1st wireless base station) 20-1, base station (the 2nd wireless base station) 33, relay station 10-1,10-2 and mobile radio station 2.Upper base station 20-1 is wirelessly connected with base station 33, and upper base station 20-1 is wirelessly connected with relay station 10-1,10-2.In addition, there is mobile radio station 2 the subordinate of base station 33.
In such system configuration, when the switching of mobile radio station 2 is identified according to the MeasurementReport from mobile radio station 2 in base station 33, carry out the selected of handover destination base station.Here, there is relay station 10-1,10-2 if switch in the candidate of destination, and entrust the upper base station 20-1 of relay station 10-1,10-2 to act on behalf of.
Figure 10 is the figure that communication sequence is shown.Show when to include relay station 10-1,10-2 in mobile destination candidate, make the order during transmission of the upper base station 20-1 proxy-switching request of relay station 10-1,10-2.
Reception level measuring information, when performing switching, is sent to base station 33 by MeasurementReport by (S31) mobile radio station 2.
(S32) base station 33, when receiving MeasurementReport, is identified mobile radio station 2 and will be performed switching.Base station 33 generates ProxyRequest and is sent to upper base station 20-1, entrusts upper base station 20-1 to carry out the agency of hand-off process.
(S33) upper base station 20-1, when receiving ProxyRequest, according to the reception level measuring information comprised in ProxyRequest, identifies and there is relay station 10-1,10-2 in the switching destination candidate that incoming level is good.First upper base station 20-1 sends HORequest to relay station 10-1.
(S34) relay station 10-1, when receiving HORequest, is judged to switch according to the congestion state etc. of our station, returns HOFail to upper base station 20-1.
(S35) upper base station 20-1, when receiving the HOFail corresponding with relay station 10-1, sends HORequest to the relay station 10-2 of other candidates.
(S36) relay station 10-2 receives HORequest, if be judged as switching, then returns HOOK to upper base station 20-1.
Relay station 10-2 is defined as switching destination according to the content of HOOK by (S37) upper base station 20-1, by ProxyResponse, its result is informed to base station 33.
(S38) base station 33 is when receiving ProxyResponse, and identifying handover destination base station is relay station 10-2, by HOcommand, this situation is informed to mobile radio station 2.
By the wireless communication system 1a as above illustrated, the channel radio traffic between base station 33 and upper base station 20-1 can be cut down.
Then illustrate and make upper base station act on behalf of the interference volume measured by relay station to other base station repeats and the control received from the report of the interference volume of other base stations.In each base station, mutually will report disturbance regime to carry out interference to control, the interference volume of our station is also reported to other base stations by relay station, and receives the report from the interference volume of other base stations.
Therefore, about interference volume, also same with switching, wirelessly to receive and dispatch via upper base station, therefore, in the Control on Communication relevant with the transmitting-receiving of interference volume, also upper base station is made to act on behalf of, the reduction of the channel radio traffic between realizing between relay station and upper base station.
Figure 11 shows the structure example of relay station, and Figure 12 is the figure of the structure example that upper base station is shown.Relay station 10b has communication control unit 11-2, commission order portion 12.Communication control unit 11-2 comprises interference volume information treatment part 11b.Upper base station 20b has communication control unit 21 and agentbased control portion 22-2.Agentbased control portion 22-2 comprises interference volume information treatment part 22b.
The interference volume information treatment part 11b of relay station 10b measures and preserves the interference volume of our station, gives commission order portion 12 by interference volume information.Interference volume information is included in ProxyRequest and informs to upper base station 20b by commission order portion 12.In the interference volume information treatment part 22b of the upper base station 20b had notice in agentbased control portion 22-2, act on behalf of the interference volume message notice from relay station 10b to peripheral base station.In addition, add up to the interference volume information from peripheral base station by interference volume information treatment part 22b, aggregate result is sent to relay station 10b from agentbased control portion 22-2.
Figure 13 is the figure that communication sequence is shown.Show and make upper base station 20b act on behalf of the interference volume to other base station repeats relay stations 10b and the order received from the report of the interference volume of other base stations.
(S41) relay station 10b acts on behalf of to other base station repeats interference volume information and the report received from the interference volume information of other base stations to ask upper base station, ProxyRequest is sent to upper base station 20b.In addition, in ProxyRequest, include the interference volume information (relay station side interference volume information) measured by relay station 10b.
(S42) upper base station 20b receives ProxyRequest, sends ReportRequest, the interference volume information (base station side interference volume information) that request report is measured by base station 31 to base station 31.Further, the interference volume information of relay station 10b is included in ReportRequest, notifies the interference volume information of relay station 10b thus to base station 31.
The interference volume information of our station, when receiving ReportRequest, is included in InterferenceReport and returns to upper base station 20b by (S43) base station 31.
(S44) upper base station 20b sends ReportRequest to base station 32, the interference volume information that request report is measured by base station 32.Further, the interference volume information of relay station 10b is included in ReportRequest, notifies the interference volume information of relay station 10b thus to base station 32.
The interference volume information of our station, when receiving ReportRequest, is included in InterferenceReport and returns to upper base station 20b by (S45) base station 32.
(S46) upper base station 20b by ProxyResponse by the interference volume message notice of base station 31,32 to relay station 10b.
As mentioned above, be configured to: the interference volume information of entrusting upper base station 20b to be measured by relay station 10b to each base station repeats or collect the interference volume information measured by each base station.Thereby, it is possible to cut down the channel radio traffic between relay station 10b and upper base station 20b.
In addition, about the report of interference volume information, be carry out when meeting the condition preset sometimes, or report termly.About these modes, upper base station 20b preserves the interference volume information from other base stations in advance, if exist from the proxy requests of relay station 10b, then by the message notice of preserving to relay station 10b.
Then to illustrate in multiple base station synergistically to mobile radio station carry out data send time, make upper base station act on behalf of the control sending relevant schedule information to base station notice and data.
In LTE-advanced, have studied importing be called as CoMP (CoordinatedMultiplePointtransmissionandreception), each base station sends the control of data to mobile radio station synergistically.
In CoMP, the scheduling that data send is carried out in the base station as center, and other base stations send according to this schedule information.When the base station as center is relay station, when sending schedule information via upper base station to each base station from relay station, channel radio traffic increases.Therefore, make the notice of upper base station scheduling agent information, the reduction of the channel radio traffic between realizing between relay station and upper base station.
The figure of Figure 14 to be the figure of the structure example that relay station is shown, Figure 15 be structure example that upper base station is shown.Relay station 10c possesses communication control unit 11-3, commission order portion 12.Communication control unit 11-3 comprises schedule information handling part 11c.Upper base station 20c has communication control unit 21-3 and agentbased control portion 22.Communication control unit 21-3 comprises schedule information handling part 21c.
The schedule information handling part 11c operation dispatching of relay station 10c, gives commission order portion 12 by schedule information.Schedule information is included in ProxyRequest by commission order portion 12, informs upper base station 20c.
The agentbased control portion 22 of upper base station 20c receives ProxyRequest, extracts schedule information and send to the schedule information handling part 21c in communication control unit 21-3 from ProxyRequest.Further, schedule information is sent to base station 31,32 by agentbased control portion 22.Schedule information handling part 21c configuration scheduling information in our station in communication control unit 21-3.
Figure 16 is the figure that communication sequence is shown.Show the order when mobile radio station 2 of relay station 10c to subordinate performs CoMP.
The scheduling that (S51) relay station 10c execution sends the data based on CoMP that mobile radio station 2 carries out, generates and comprises the schedule information that data send timing.Further, by ProxyRequest, entrust upper base station 20c to act on behalf of and notify schedule information to base station 31,32.In ProxyRequest, include schedule information.
(S52) upper base station 20c, when receiving ProxyRequest, extracts schedule information, schedule information is informed to respectively base station 31,32.
(S53), according to schedule information, sends data from relay station 10c, upper base station 20c and 31,32 pairs, base station mobile radio station 2.
So just being configured to: when carrying out mobile radio station 2 sending based on the data of CoMP, upper base station 20c being acted on behalf of and sends relevant schedule information to base station notice with data.Thereby, it is possible to cut down the channel radio traffic between relay station 10c and upper base station 20c.
As described above, in wireless communication system 1, be configured to: relay station 10 entrusts upper base station 20 to act on behalf of communication between base station 31,32, and on commission upper base station 20 replaces relay station 10 to communicate with base station 31,32, result of communication is sent to relay station 10.
Thus, owing to reducing the channel radio traffic between relay station 10 and upper base station 20, therefore, it is possible to cut down from the interference of other base stations and to the interference that other base stations are brought, can also processing delay be cut down, the raising of communication quality can be realized.
About above-mentioned explanation, illustrate only principle of the present invention.In addition, to those skilled in the art, various deformation, change can also be implemented, the invention is not restricted to accurate structure and the application examples of above shown also explanation, should be understood that the scope of the present invention that corresponding all variation and equivalent all belong to appended claims and determined by its equivalent.
Symbol description
1: wireless communication system; 2: mobile radio station; 10: relay station; 20: upper base station (the 1st wireless base station); 31,32: base station (the 2nd wireless base station).
Claims (4)
1. one kind for the method in wireless communication system, this wireless communication system comprises: the 1st wireless base station, to be connected and multiple 2nd wireless base stations carrying out communicating with described 1st wireless base station, to be wirelessly connected with described 1st wireless base station and to carry out the relay station that communicates and mobile radio station via described 1st wireless base station and described 2nd wireless base station by wired mode with described 1st wireless base station
Described method comprises following steps:
When expect the wireless signaling that exchanges with described relay station often time, described 2nd wireless base station sends via wired transmission interface and entrusts, and this trust replaces described 2nd wireless base station to communicate with described relay station for entrusting described 1st wireless base station;
On commission described 1st wireless base station replaces described 2nd wireless base station to communicate with described relay station via wireless transport interface, and via wired transmission interface, result of communication is sent to described 2nd wireless base station; And
When expecting that the number of times of the wireless signaling exchanged with described relay station is few, described 2nd wireless base station communicates with described relay station via wireless transport interface.
2. method according to claim 1, wherein,
The method also comprises following steps:
Described 2nd wireless base station receives described result of communication in response to from described 1st wireless base station, and sends control information to described mobile radio station; And
Described mobile radio station receives described control information.
3. the method that adopts of a wireless base station, 1st wireless base station is wirelessly connected with relay station, and, be connected with multiple 2nd wireless base station by wired mode, communicate between described relay station with described 2nd wireless base station via the 1st wireless base station
Described method comprises following steps:
The wireless signaling exchanged between described relay station and described 2nd wireless base station often time, receive trust via wired transmission interface from described 2nd wireless base station, this trust replaces described 2nd wireless base station to communicate with described relay station for entrusting described 1st wireless base station;
Described 2nd wireless base station is replaced to communicate with described relay station via wireless transport interface in response to receiving described trust;
Via wired transmission interface, result of communication is sent to described 2nd wireless base station; And
When the number of times of the wireless signaling exchanged between described relay station and described 2nd wireless base station is few, do not receive described trust.
4. the method that adopts of the 2nd wireless base station, the 2nd wireless base station is connected with the 1st wireless base station by wired mode, and communicates with relay station via described 1st wireless base station,
Described method comprises following steps:
When expect the wireless signaling that exchanges with described relay station often time, to be sent to described 1st wireless base station by wired transmission interface and entrust, this trust replaces described 2nd wireless base station to communicate with described relay station for entrusting described 1st wireless base station;
Via wired transmission interface from described 1st wireless base station send result of communication, this result of communication via wireless transport interface the 1st entrusted wireless base station with carry out communicating between described relay base station producing; And
When expecting that the number of times of the wireless signaling exchanged with described relay station is few, communicate with described relay base station via wireless transport interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200980159797.7A CN102804835B (en) | 2009-06-16 | 2009-06-16 | Wireless communication system |
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| US8140077B2 (en) * | 2006-04-19 | 2012-03-20 | Nokia Corporation | Handover or location update for optimization for relay stations in a wireless network |
| KR20080041576A (en) * | 2006-11-07 | 2008-05-13 | 삼성전자주식회사 | Method for handover in a wireless communication system |
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