CN104469891A - Method, system and device for selecting donor eNB for relay node - Google Patents
Method, system and device for selecting donor eNB for relay node Download PDFInfo
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- CN104469891A CN104469891A CN201310435008.6A CN201310435008A CN104469891A CN 104469891 A CN104469891 A CN 104469891A CN 201310435008 A CN201310435008 A CN 201310435008A CN 104469891 A CN104469891 A CN 104469891A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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Abstract
The invention discloses a method, a system and a device for selecting a donor eNB for a relay node. According to respectively acquired data capacity related information of a plurality of neighbouring eNBs meeting signal intensity requirement of data transmission of the relay node, and channel quality information of return links of the relay node and the plurality of neighbouring eNBs, available channel capacity of the return links between the neighbouring eNBs and the relay mode are respectively computed, then the neighbouring eNB with the return link of largest available channel capacity is taken as the donor eNB of the relay node to be accessed. The method improves the transmission performance of the relay node.
Description
Technical field
The present invention relates to field of wireless communications systems, particularly one selects the method, system and device of the base station, donor cell of via node (RN).
Background technology
In order to tackle the wireless propagation environment of various complexity, solving the covering problem of following Long Term Evolution (LTE) network design, in the LTE-AR10 release protocol of third generation partner program (3GPP), standardization having been carried out to RN.By adding a RN between macro base station and user terminal, the link that direct transfers between macro base station and user terminal is divided into two sections: the wireless link between macro base station and RN is called return link, i.e. Un interface; Wireless link between RN and user terminal is called access link, i.e. Uu interface, the LTE system structural representation of what prior art as shown in Figure 1 provided have RN.By rationally disposing RN, two sections of links after fractionation can have the propagation distance shorter than the link that direct transfers, shelter simultaneously in round also can reduce, and makes two sections of links after splitting all have transmittability than the better radio propagation conditions of the link that direct transfers and Geng Gao.
The main feature of RN comprises: 1) provide wireless backhaul, in the scene that some optical fiber cannot arrive or wired passback construction is more difficult, such as: the residential building dividing the indoor office environments of deployment, optical fiber cannot arrive family without room, without the micro-covering scene in city of wired passback and remote suburb or rural area etc., effectively can expand covering by introducing the RN with wireless backhaul function, solving the deficient problem of fiber resource and disposing flexible; 2) coverage enhancement, in the LTE-AR10 stage, RN is main or for solving coverage enhancement but not capacity boost, can eliminate the shade overlay area or coverage hole that pile group produces, improving the covering power of base station by introducing RN.
RN is mainly divided into RN and the outer RN of band in band.In band, the return link of RN transmits in identical band resource with access link, time division multiplexing; Be with the return link of outer RN and access link at different transmitted in band, frequency division multiplexing.In the lte networks, main it is considered that the interior RN of band, in band, RN has oneself independently cell ID, is equivalent to an independently community, can carries out the process of layer 3.
RN is when electrifying startup, its behavior and user terminal similar, as when selecting donor cell, RN scans all communities that it can detect, and the community selecting its levels of service maximum access, levels of service can be reference signal access power (RSRP), as the donor cell evolution base station (DeNB, Donor eNB) of RN.Usually, be all fixing because RN installs generally, its DeNB selected also is generally changeless.In addition, when disposing RN in real network, also can consider that the beam direction for DeNB is optimized, as when returning antenna and using directional antenna, the main lobe direction of the passback antenna of RN can be aimed at the main lobe direction of the antenna of DeNB, to reach the interference improving useful signal energy and suppress other communities as far as possible.
Usually, the transmission performance of RN community is limited to the transmission performance of return link, therefore, how to improve the transmission performance bottleneck of RN community, i.e. the transmission performance of return link, is the key strengthening RN systematic function.
At present, RN select DeNB time, RN and user terminal similar, mainly according to its detect RSRP select, selected DeNB is generally fixing.But because RN and user terminal are different, RN administers an individual cell, access link needs serve more user terminal, therefore, to the data capacity demand of DeNB much larger than user terminal.
RN is deployed in blind area or the weak area of coverage to carry out benefit blind, and block or penetrate to overcome building the signal attenuation that diffraction etc. causes, RN is arranged on higher and open position usually, as roof etc.Thus, compare the user terminal being generally in ground or indoor, usual RN receives the signal of more multiple cell.Fig. 2 is the schematic network structure that prior art RN selects DeNB, and as shown in the figure, although RN is not in the coverage of eNB2, general, this coverage is the coverage of level ground, and because the decorating position of RN is higher, RN still can receive the signal of eNB2.Consider that the signal strength signal intensity that RN receives from eNB1 is the strongest, therefore, it can select eNB1 as its DeNB.But, consider such a case, suppose that eNB2 is deployed in office building region, main office building user terminal of giving provides high speed bandwidth data services, after evening, during office building user terminal is gone back home, now, the load of eNB2 is very low, and namely the loading condition of eNB2 has typical tidal effect, now, even if detect the levels of service of eNB1 be better than eNB2, but due to the load of eNB1 with eNB2 different, cause eNB1 with eNB2 can distribute to the resource of RN different, then in such cases, RN selects eNB1 may not be optimum as DeNB.Especially, consider that LTE eNB in the future may be the multicarrier macro base station with FD double frequency, the low-frequency range coverage as F-band is comparatively large, and provide covering, the high band coverage as D frequency range is little, but bandwidth is comparatively large, is mainly used in providing capacity.On these high bands, because coverage is little, be with roomy, as eNB2 uses D frequency range to carry out the concurrent heating of office building hot spot region, namely clearly, can there is obvious tidal effect in the degree of fluctuation of its load, the time load that works by day is heavier, After Hours load in evening is comparatively light, and user terminal selecting eNB2 may be more excellent as DeNB than employing user terminal selecting eNB1 as DeNB.
Can find out, cause RN to select eNB1 to be as the reason of DeNB, RN is when selecting DeNB, and what mainly compare is the signal strength signal intensity of the reflection levels of service of such as RSRP, and does not consider the loading condition of macro base station.And in fact, RN is not only limited to and signal strength signal intensity between DeNB in the transmission performance of return link, is also limited to the interface-free resources that DeNB provides, i.e. the loading condition of DeNB.So RN determines DeNB according to the signal strength signal intensity detecting base station, peripheral cell, and the transmission performance of RN can be caused to reduce.
Summary of the invention
In view of this, the invention provides a kind of method selecting the base station, donor cell of via node, the method can improve the transmission performance of RN.
The present invention also provides a kind of system selecting the base station, donor cell of via node, and this system can improve the transmission performance of RN.
The present invention also provides a kind of device selecting the base station, donor cell of via node, and this device can improve the transmission performance of RN.
For achieving the above object, to be of the invention processly specifically achieved in that
Select a method for the base station, donor cell of via node, the method comprises:
Obtain respectively and meet the data capacity relevant information that via node RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data;
Obtain the return link channel quality information of RN and the plurality of neighbor base station respectively;
According to data capacity relevant information and the corresponding return link channel quality information of obtained the plurality of neighbor base station, calculate the return link available channel capacity between the plurality of neighbor base station and RN respectively;
Neighbor base station that wherein return link available channel capacity is maximum is selected to access as base station, the donor cell DeNB of RN.
The signal strength signal intensity of described transmission data is the total reference signal access power RSRP of LTE network and interfere information, or Reference Signal Received Quality RSRQ;
Described data capacity information comprises the load information of neighbor base station, and the Un interface configuration information of return link between neighbor base station and RN;
Employing formula (1) calculates the return link available channel capacity between the plurality of neighbor base station and RN respectively: C
i=f(SINR
i, 1-T
i, config
i) formula (1);
Wherein, C
iidentify i-th return link available channel capacity between neighbor base station and RN; SINR
iidentify the signal to noise ratio of i-th return link between neighbor base station and RN, T
ithe load information of i-th neighbor base station, config
iit is the Un interface configuration information of i-th return link between neighbor base station and RN; F() expression and SINR
i, 1-T
iand config
irelevant function.
Described method is performed by RN, before the process per se, also comprises:
RN accesses former DeNB, detects the signal strength signal intensity of neighbor base station, the neighbor base station identification information of the signal strength signal intensity with the measurement thresholding being greater than setting is sent to former DeNB;
RN obtains multiple neighbor base stations of the signal strength signal intensity requirement meeting RN transmission data data capacity relevant information from former DeNB is:
RN obtains the data capacity relevant information of the neighbor base station of corresponding neighbor base station identification information from former DeNB, the data capacity relevant information of the neighbor base station of described corresponding neighbor base station identification information is that former DeNB gets from the neighbor base station of LTE network side or corresponding neighbor base station identification information;
Described selection DeNB is target DeNB;
Described RN also comprises before accessing target DeNB: disconnect the connection between former DeNB.
Described method is performed by RN, before the process per se, also comprises:
RN detects the signal strength signal intensity of neighbor base station, using the signal strength signal intensity with the measurement thresholding being greater than setting as the multiple neighbor base stations meeting via node RN and transmit the signal strength signal intensity of data, accesses successively.
The signal strength signal intensity of described transmission data is the total RSRP of LTE network and interfere information, or RSRQ;
Described data capacity information comprises the load information of neighbor base station, and the Un interface configuration information of return link between neighbor base station and RN;
Employing formula (2) calculates the return link available channel capacity between the plurality of neighbor base station and RN respectively: C
i=g(SINR
i) * min(config
i, (1-T
i) * DN), formula (2);
Wherein, g() be spectrum efficiency according to each time slot corresponding to the signal to noise ratio of i-th return link between neighbor base station with RN or throughput; T
iit is the load information of i-th neighbor base station; DN is the number of descending time slot in the current time slots configuration of i-th neighbor base station; Config
irepresent the number of the return link descending time slot in the Un interface configuration information of RN.
The former DeNB that described method is accessed by RN performs, and before the process per se, also comprises:
Former DeNB receives the neighbor base station identification information with the signal strength signal intensity of the measurement thresholding being greater than setting that RN sends, and with the return link channel quality information of neighbor base station;
Former DeNB obtains multiple neighbor base stations of the signal strength signal intensity requirement meeting RN transmission data data capacity relevant information from RN is:
Former DeNB, from the neighbor base station of LTE network side or corresponding neighbor base station identification information, obtains the data capacity relevant information of the neighbor base station of corresponding neighbor base station identification information;
Described selection DeNB is target DeNB;
Before described access target DeNB, also comprise: former DeNB indicates the connection between RN disconnection with former DeNB, instruction RN accesses target DeNB.
The signal strength signal intensity of described transmission data is the total RSRP of LTE network and interfere information, or RSRQ;
Described data capacity information comprises the load information of neighbor base station, and the Un interface configuration information of return link between neighbor base station and RN;
Employing formula (3) calculates the return link available channel capacity between the plurality of neighbor base station and RN respectively:
C
i=g(MR
i) * min(config
i, (1-T
i) * DN), formula (3);
Wherein, MR
ibe the return link channel quality information between RN and i-th neighbor base station, the g(that RN reports) be spectrum efficiency according to each time slot corresponding to i-th return link channel quality information between neighbor base station with RN or throughput; T
iit is the load information of i-th neighbor base station; DN is the number of descending time slot in the current time slots configuration of i-th neighbor base station; Config
irepresent the number of the return link descending time slot in the Un interface configuration information of the return link between RN and i-th neighbor base station.
The method also comprises: RN arranges remote-controllable or automatic rotation antenna function, and after selecting DeNB access, the antenna automatic rotation of this function control RN, is automatically rotated to the direction that the signal strength signal intensity that accepts DeNB is maximum.
Select a system for the base station, donor cell of via node, this system handbag is drawn together: RN and target DeNB, wherein,
RN, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and detect with the return link channel quality information of the plurality of neighbor base station, after calculating the return link available channel capacity between the plurality of neighbor base station and RN respectively, neighbor base station that wherein return link available channel capacity is maximum is selected to access as the target DeNB of RN;
Target DeNB, for accessing RN.
Described system also comprises former DeNB, for obtaining the data capacity relevant information of the neighbor base station of the corresponding multiple neighbor base station identification informations received respectively, sends to RN;
RN, also meet for sending to former DeNB multiple neighbor base station identification informations that RN transmits the signal strength signal intensity requirement of data, receive from former DeNB and meet the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, before access target DeNB, disconnect the connection between former DeNB.
Select a device for the base station, donor cell of via node, this device comprises: computing module, selection module and access module, wherein,
Computing module, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and detect with the return link channel quality information of the plurality of neighbor base station, calculate the return link available channel capacity between the plurality of neighbor base station and RN respectively;
Select module, for selecting neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN;
Access module, for accessing target DeNB.
This device also comprises transceiver module, multiple neighbor base station identification informations that the signal strength signal intensity transmitting data for meeting RN to former DeNB transmission requires, receive from former DeNB and meet the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data;
Access module, also for before access target DeNB, disconnects the connection between former DeNB.
Select a system for the base station, donor cell of via node, comprising: RN, former DeNB and target DeNB, wherein,
RN, for send to former DeNB meet multiple neighbor base station identification information that signal strength signal intensity that RN transmits data requires and and RN between return link channel quality information; Under the instruction of former DeNB, disconnect the connection between former DeNB, access the target DeNB of corresponding target DeNB identification information;
Former DeNB, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and RN send with the return link channel quality information of the plurality of neighbor base station, after calculating the return link available channel capacity between the plurality of neighbor base station and RN respectively, select neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN, target DeNB identification information is sent to RN, and instruction RN accesses target DeNB;
Target DeNB, for accessing RN.
Select a device for the base station, donor cell of via node, comprise acquisition module, computing module, selection module and indicating module, wherein,
Acquisition module, for obtaining the data capacity relevant information of multiple neighbor base stations meeting signal strength signal intensity that RN transmits data and require respectively, and RN send with the return link channel quality information of the plurality of neighbor base station;
Computing module, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and RN send with the return link channel quality information of the plurality of neighbor base station, calculate the return link available channel capacity between the plurality of neighbor base station and RN respectively;
Select module, for selecting neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN;
Indicating module, is used to indicate RN and disconnects access, access target DeNB.
As can be seen from the above scheme, the present invention is when for base station, trunk node selection donor cell, according to the data capacity relevant information of multiple neighbor base stations that the signal strength signal intensity meeting via node transmission data obtained respectively requires, and the return link channel quality information of via node and the plurality of neighbor base station, after calculating the return link available channel capacity between the plurality of neighbor base station and via node respectively, the neighbor base station that wherein return link available channel capacity is maximum is selected to access as the base station, donor cell of via node.Transmission performance due to RN is not only limited to the signal strength signal intensity of the return link between itself and base station, donor cell, and be limited to the data transmission capacity of the return link between base station, donor cell, so when selecting base station, donor cell in conjunction with these two aspects factor, the signal strength signal intensity size transmitting data with the such via node only detected by via node of prior art is selected, compared with the scheme of base station, donor cell, to improve the transmission performance of RN.
Accompanying drawing explanation
The LTE system structural representation with RN that Fig. 1 provides for prior art;
Fig. 2 is the schematic network structure that prior art RN selects DeNB;
The method flow diagram of the base station, donor cell of the selection via node that Fig. 3 provides for the embodiment of the present invention;
Method example one flow chart of the RN selection DeNB that Fig. 4 provides for the embodiment of the present invention;
Method example two flow chart of the RN selection DeNB that Fig. 5 provides for the embodiment of the present invention;
Fig. 6 for former DeNB that the embodiment of the present invention provides be the method flow diagram of RN select target DeNB;
System one structural representation of the base station, donor cell of the selection via node that Fig. 7 provides for the embodiment of the present invention;
Device one structural representation of the base station, donor cell of the selection via node that Fig. 8 provides for the embodiment of the present invention;
System two structural representation of the base station, donor cell of the selection via node that Fig. 9 provides for the embodiment of the present invention;
Device two structural representation of the base station, donor cell of the selection via node that Figure 10 provides for the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in further detail.
As can be seen from background technology, RN selects to cause reason that the transmission performance of RN is not high mainly during DeNB: the signal strength signal intensity size of the transmission data only detected according to RN selects DeNB, and does not consider the transmission data capacity size of the return link between RN and DeNB.But the transmission data capacity size of the return link between RN and DeNB also has conclusive impact to the transmission performance of RN.
Therefore, the present invention is when selecting DeNB for RN, the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data is met according to what obtain respectively, and the return link channel quality information of RN and the plurality of neighbor base station, after calculating the return link available channel capacity between the plurality of neighbor base station and RN respectively, neighbor base station that wherein return link available channel capacity is maximum is selected to access as the DeNB of RN.Owing to combining the these two aspects factor of the transmission performance affecting RN when selecting the DeNB of RN, so the transmission performance of RN can be improved.
The method flow diagram of the base station, donor cell of the selection via node that Fig. 3 provides for the embodiment of the present invention, its concrete steps are:
Step 301, respectively acquisition meet the data capacity information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data;
In this step, RN conventionally detects the signal strength values of the transmission data of the such as RSRP of neighbor base station around it, and detected signal strength values is compared with set measurement thresholding, using the neighbor base station that neighbor base station corresponding for the signal strength values being greater than set measurement threshold value requires as the signal strength signal intensity meeting RN transmission data, described measurement thresholding is arranged according to actual needs, and the signal strength signal intensity of this measurement thresholding ensures that RN can transmit data;
Certainly, the signal strength signal intensity of transmission data can also be the total RSRP of LTE network and interfere information, or Reference Signal Received Quality (RSRQ);
In this step, data capacity information comprises the load information of neighbor base station, and the Un interface configuration information of return link between neighbor base station and RN;
Step 302, the load information of multiple neighbor base stations required according to meeting of obtaining the respectively signal strength signal intensity that RN transmits data, and the return link channel quality information of RN and the plurality of adjacent area, calculate the return link available channel capacity between the plurality of neighbor base station and RN respectively;
In this step, employing formula (1) calculates the return link available channel capacity between the plurality of neighbor base station and RN respectively:
C
i=f(SINR
i, 1-T
i, config
i) formula (1)
Wherein, C
iidentify i-th return link available channel capacity between neighbor base station and RN; SINR
iidentify the signal to noise ratio of i-th return link between neighbor base station and RN, T
ithe load information of i-th neighbor base station, config
iit is the Un interface configuration information of i-th return link between neighbor base station and RN; F() expression and SINR
i, 1-T
iand config
irelevant function;
Step 303, cell base station that wherein return link available channel capacity is maximum is selected to access as the DeNB of RN.
Process described in Fig. 3 due to the difference of executive agent, can have two kinds of different implementations, illustrates respectively below.
When executive agent is RN, be exactly RN when initiatively selecting DeNB, as shown in Figure 4, Fig. 4 selects method example one flow chart of DeNB for RN that the embodiment of the present invention provides to its process, select target DeNB again after RN conventionally first selects former DeNB to access, its concrete steps are:
Step 401, RN access this former DeNB after selecting former DeNB according to the signal strength signal intensity size of detected transmission data;
Step 402, RN measure the signal strength signal intensity of neighbor base station, and after comparing with the measurement thresholding arranged respectively, adjacent area identification information signal strength signal intensity being greater than the measurement thresholding of setting sends to former DeNB;
In this step, adjacent area identification information can be Physical Cell Identifier (PCI) or Evolved UTRAN network cellular global identity (ECGI);
Here, PCI is only carried on synchronizing signal, and comprise master sync signal and auxiliary synchronous signals (PSS/SSS) transmission, RN just can obtain the PCI of neighbor base station by demodulation PSS/SSS, fairly simple, sends easily; ECGI is carried in system broadcast message (SIB), more difficult for demodulation RN, but may not possess uniqueness due to PCI, can to avoid confusion problem so send ECGI;
After step 403, former DeNB receive adjacent area identification information, access the Mobility Management Entity (MME) of LTE network side or pass through X2 mouth Signalling exchange with the neighbor base station of corresponding adjacent area identification information, determining the neighbor base station can supporting RN;
In this step, not all neighbor base station can support RN and Un interface protocol, so will confirm;
Step 404, former DeNB get the data capacity relevant information of the neighbor base station can supporting RN, comprise load information and and RN between return link Un interface configuration information after, send to RN by high-level signaling;
In this step, high-level signaling can be radio resource control (RRC) signaling;
After step 405, RN receive, in conjunction with the return link channel quality information with each neighbor base station, calculate the return link available channel capacity with each neighbor base station respectively according to formula (1);
Step 406, RN select neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN, break with the connection of former DeNB after, access target DeNB.
In this embodiment, former DeNB is also as a neighbor base station of RN, the return link available channel capacity of carrying out between RN calculates, that calculate with other neighbor base stations again compare with return link available channel capacity between RN after, if former DeNB is maximum, then do not need to disconnect, still by the DeNB of former DeNB as RN.
Method example two flow chart of the RN selection DeNB that Fig. 5 provides for the embodiment of the present invention, this example performs the community access operation of a traversal, and selects the cell base station of maximum return link available channel capacity as DeNB, and its concrete steps are:
After step 501, RN electrifying startup, its neighbor base station that can detect is measured in search, obtains the signal strength signal intensity of each neighbor base station, and after comparing with the measurement thresholding arranged respectively, obtains the neighbor base station that multiple signal strength signal intensity is greater than the measurement thresholding of setting;
Step 502, RN access the plurality of neighbor base station successively, get the data capacity relevant information of the plurality of neighbor base station, comprise load information and and RN between the Un interface configuration information of return link;
Step 503, RN, by the data capacity relevant information of each neighbor base station, in conjunction with the return link channel quality information with each adjacent area, calculate the return link available channel capacity with each neighbor base station according to formula (1) respectively;
Step 504, RN select neighbor base station that wherein return link available channel capacity is maximum as the DeNB of RN and access.
Lift a specific embodiment to illustrate, in the method, formula (1) is specifically as follows:
C
i=g(SINR
i) * min(config
i, (1-T
i) * DN), formula (2)
Wherein, g() be spectrum efficiency according to each time slot corresponding to the signal to noise ratio of i-th return link between neighbor base station with RN or throughput, can be calculated by Shannon equation, also can mapping table be set, arranging of this mapping table can be that link level simulation curve table by looking into TD-LTE obtains, this mapping table can be stored in RN, and can according to the actual running results real-time update of RN; DN is the number of descending time slot in the current time slots configuration of i-th neighbor base station; Config
irepresent the number of the return link descending time slot in the Un interface configuration information of RN, configure decision by the type of RN with the return link adopted: as to RN in band, if its use return link configuration 4, then config
ivalue is 2, and to band outer RN, then config
ivalue is DN.
Like this, method provided by the invention is applied in the process shown in Fig. 2, then the SINR of eNB2 is lower than eNB1, but because the load level of eNB2 is higher than eNB1, then by the calculating of formula (2), select that eNB2 can obtain as DeNB and between RN return link available channel capacity higher than eNB1 as DeNB, at this moment, according to method provided by the invention, RN just can select eNB2 to access as DeNB, thus improve the transmission performance of RN, in addition, also effectively make use of the idling-resource of eNB2, release the resource of the eNB1 that RN takies, improve handling up of other user terminals of eNB1 service, also eNB2 and eNB1 is served to the effect of certain load balancing.
When executive agent be RN conventionally select former DeNB time, when former exactly DeNB is RN select target DeNB, as shown in Figure 6, Fig. 6 for former DeNB that the embodiment of the present invention provides be the method flow diagram of RN select target DeNB, its concrete steps are:
Step 601, RN access this former DeNB after selecting former DeNB according to the signal strength signal intensity size of detected transmission data;
In this step, measured signal strength signal intensity can be RSRP and interfere information, or LTE network Reference Signal Received Quality (RSRQ);
Step 602, RN measure the signal strength signal intensity of neighbor base station, and after comparing with the measurement thresholding arranged respectively, signal strength signal intensity are greater than signal message measured by the adjacent area identification information of the measurement thresholding of setting and correspondence and send to former DeNB;
In this step, adjacent area identification information can be physical region mark (PCI) or Evolved UTRAN network cellular global identity (ECGI);
Measured signal message is RSRP and interfere information, or RSRQ;
After step 603, former DeNB receive adjacent area identification information, access MME or pass through X2 mouth Signalling exchange with the neighbor base station of corresponding adjacent area identification information, determine the neighbor base station can supporting RN;
In this step, not all neighbor base station can support RN and Un interface protocol, so will confirm;
Step 604, former DeNB get the data capacity relevant information of the neighbor base station of corresponding adjacent area identification information, comprise the Un interface configuration information of the return link of load information and RN and this neighbor base station;
The data capacity relevant information of the neighbor base station of the corresponding adjacent area identification information got is combined the return link channel quality information with each neighbor base station by step 605, former DeNB, calculates the return link available channel capacity with each neighbor base station respectively according to formula (1);
Here, reported by RN with the return link channel quality information of each neighbor base station, namely the measuring-signal information that reports of RN, the RSRP total for LTE network and interfere information, or RSRQ;
Step 606, former DeNB select neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN, by high-level signaling, target DeNB identification information is sent to RN, RN is according to this target DeNB identification information determination target DeNB in instruction, break with the connection of former DeNB after, access target DeNB.
In this embodiment, former DeNB is also as a neighbor base station of RN, the return link available channel capacity of carrying out between RN calculates, that calculate with other neighbor base stations again compare with return link available channel capacity between RN after, if former DeNB is maximum, then do not need to disconnect, still by the DeNB of former DeNB as RN.
Lift the method described in an object lesson key diagram 6
In the method, formula (1) is specifically as follows:
C
i=g(MR
i) * min(config
i, (1-T
i) * DN), formula (3)
Wherein, MR
iit is the return link channel quality information between RN and i-th neighbor base station, can indicate (CQI) for channel quality, the g(that RN reports) be spectrum efficiency according to each time slot corresponding to i-th return link channel quality information between neighbor base station with RN or throughput, as determined adaptive modulation coding mode (AMC) according to CQI, spectrum efficiency or the throughput of corresponding each time slot just can be determined according to AMC; DN is the number of descending time slot in the current time slots configuration of i-th neighbor base station; Config
irepresent the number of the return link descending time slot in the Un interface configuration information of the return link between RN and i-th neighbor base station, configure decision by the type of RN with the return link adopted: as to RN in band, if its use return link configuration 4, then config
ivalue is 2, and to band outer RN, then config
ivalue is DN.
Method provided by the present invention performs according to the cycle arranged when performing, and can be set to a few hours or half a day is the cycle.This is because, consider that RN does not support handover operation, it performs the operation accessing target DeNB after must disconnecting the connection between former DeNB again, this just means that all user terminals that RN serves all can disconnect the connection with LTE network side, and consider that RN also needs a stable operating state, perform cell reselection frequently and can bring larger negative effect to network, and, in real network, the period of change of the tidal effect of load is also long, therefore, the execution cycle of method provided by the invention is long.
In RN provided by the invention, the module of remote-controllable or automatic rotation antenna can also be set, after each RN reselects DeNB, this module meeting control antenna automatic rotation, be automatically rotated to the maximum direction of the signal strength signal intensity that accepts DeNB to stop, the further return link performance improved between RN and DeNB, improves the transmission performance of RN.
System one structural representation of the base station, donor cell of the selection via node that Fig. 7 provides for the embodiment of the present invention, comprising: RN and target DeNB, wherein,
RN, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and detect with the return link channel quality information of the plurality of neighbor base station, after calculating the return link available channel capacity between the plurality of neighbor base station and RN respectively, neighbor base station that wherein return link available channel capacity is maximum is selected to access as the target DeNB of RN;
Target DeNB, for accessing RN.
Within the system, also comprising former DeNB, for obtaining the data capacity relevant information of the neighbor base station of the corresponding multiple neighbor base station identification informations received respectively, sending to RN;
RN, also meet for sending to former DeNB multiple neighbor base station identification informations that RN transmits the signal strength signal intensity requirement of data, receive from former DeNB and meet the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, before access target DeNB, disconnect the connection between former DeNB.
The RN structural representation that Fig. 8 provides for the embodiment of the present invention, namely RN, comprising: computing module, selection module and access module, wherein,
Computing module, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and detect with the return link channel quality information of the plurality of neighbor base station, calculate the return link available channel capacity between the plurality of neighbor base station and RN respectively;
Select module, for selecting neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN;
Access module, for accessing target DeNB.
In the apparatus, RN also comprises transceiver module, multiple neighbor base station identification informations that the signal strength signal intensity transmitting data for meeting RN to former DeNB transmission requires, receive from former DeNB and meet the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data;
Access module, also for before access target DeNB, disconnects the connection between former DeNB.
System two structural representation of the base station, donor cell of the selection via node that Fig. 9 provides for the embodiment of the present invention, comprising: RN, former DeNB and target DeNB, wherein,
RN, for send to former DeNB meet multiple neighbor base station identification information that signal strength signal intensity that RN transmits data requires and and RN between return link channel quality information; Under the instruction of former DeNB, disconnect the connection between former DeNB, access the target DeNB of corresponding target DeNB identification information;
Former DeNB, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and RN send with the return link channel quality information of the plurality of neighbor base station, after calculating the return link available channel capacity between the plurality of neighbor base station and RN respectively, select neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN, target DeNB identification information is sent to RN, and instruction RN accesses target DeNB;
Target DeNB, for accessing RN.
Device two schematic diagram of the base station, donor cell of the selection via node that Figure 10 provides for the embodiment of the present invention, namely former DeNB, comprises acquisition module, computing module, selection module and indicating module, wherein,
Acquisition module, for obtaining the data capacity relevant information of multiple neighbor base stations meeting signal strength signal intensity that RN transmits data and require respectively, and RN send with the return link channel quality information of the plurality of neighbor base station;
Computing module, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and RN send with the return link channel quality information of the plurality of neighbor base station, calculate the return link available channel capacity between the plurality of neighbor base station and RN respectively;
Select module, for selecting neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN;
Indicating module, is used to indicate RN and disconnects access, access target DeNB.
As can be seen from method, system and device provided by the invention, the present invention has considered the return link channel quality of RN and neighbor base station and the load information of neighbor base station, the DeNB of adaptively selected RN, return link available channel capacity between RN and DeNB is maximized, thus significantly improve the transmission performance of RN, effectively make use of idling-resource current in LTE network.
More than lift preferred embodiment; the object, technical solutions and advantages of the present invention are further described; be understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment done, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. select a method for the base station, donor cell of via node, it is characterized in that, the method comprises:
Obtain respectively and meet the data capacity relevant information that via node RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data;
Obtain the return link channel quality information of RN and the plurality of neighbor base station respectively;
According to data capacity relevant information and the corresponding return link channel quality information of obtained the plurality of neighbor base station, calculate the return link available channel capacity between the plurality of neighbor base station and RN respectively;
Neighbor base station that wherein return link available channel capacity is maximum is selected to access as base station, the donor cell DeNB of RN.
2. the method for claim 1, is characterized in that, the signal strength signal intensity of described transmission data is the total reference signal access power RSRP of LTE network and interfere information, or Reference Signal Received Quality RSRQ;
Described data capacity information comprises the load information of neighbor base station, and the Un interface configuration information of return link between neighbor base station and RN;
Employing formula (1) calculates the return link available channel capacity between the plurality of neighbor base station and RN respectively: C
i=f(SINR
i, 1-T
i, config
i) formula (1);
Wherein, C
iidentify i-th return link available channel capacity between neighbor base station and RN; SINR
iidentify the signal to noise ratio of i-th return link between neighbor base station and RN, T
ithe load information of i-th neighbor base station, config
iit is the Un interface configuration information of i-th return link between neighbor base station and RN; F() expression and SINR
i, 1-T
iand config
irelevant function.
3. the method for claim 1, is characterized in that, described method is performed by RN, before the process per se, also comprises:
RN accesses former DeNB, detects the signal strength signal intensity of neighbor base station, the neighbor base station identification information of the signal strength signal intensity with the measurement thresholding being greater than setting is sent to former DeNB;
RN obtains multiple neighbor base stations of the signal strength signal intensity requirement meeting RN transmission data data capacity relevant information from former DeNB is:
RN obtains the data capacity relevant information of the neighbor base station of corresponding neighbor base station identification information from former DeNB, the data capacity relevant information of the neighbor base station of described corresponding neighbor base station identification information is that former DeNB gets from the neighbor base station of LTE network side or corresponding neighbor base station identification information;
Described selection DeNB is target DeNB;
Described RN also comprises before accessing target DeNB: disconnect the connection between former DeNB.
4. the method for claim 1, is characterized in that, described method is performed by RN, before the process per se, also comprises:
RN detects the signal strength signal intensity of neighbor base station, using the signal strength signal intensity with the measurement thresholding being greater than setting as the multiple neighbor base stations meeting via node RN and transmit the signal strength signal intensity of data, accesses successively.
5. the method as described in claim 3 or 4, is characterized in that, the signal strength signal intensity of described transmission data is the total RSRP of LTE network and interfere information, or RSRQ;
Described data capacity information comprises the load information of neighbor base station, and the Un interface configuration information of return link between neighbor base station and RN;
Employing formula (2) calculates the return link available channel capacity between the plurality of neighbor base station and RN respectively: C
i=g(SINR
i) * min(config
i, (1-T
i) * DN), formula (2);
Wherein, g() be spectrum efficiency according to each time slot corresponding to the signal to noise ratio of i-th return link between neighbor base station with RN or throughput; T
iit is the load information of i-th neighbor base station; DN is the number of descending time slot in the current time slots configuration of i-th neighbor base station; Config
irepresent the number of the return link descending time slot in the Un interface configuration information of RN.
6. the method for claim 1, is characterized in that, the former DeNB that described method is accessed by RN performs, and before the process per se, also comprises:
Former DeNB receives the neighbor base station identification information with the signal strength signal intensity of the measurement thresholding being greater than setting that RN sends, and with the return link channel quality information of neighbor base station;
Former DeNB obtains multiple neighbor base stations of the signal strength signal intensity requirement meeting RN transmission data data capacity relevant information from RN is:
Former DeNB, from the neighbor base station of LTE network side or corresponding neighbor base station identification information, obtains the data capacity relevant information of the neighbor base station of corresponding neighbor base station identification information;
Described selection DeNB is target DeNB;
Before described access target DeNB, also comprise: former DeNB indicates the connection between RN disconnection with former DeNB, instruction RN accesses target DeNB.
7. method as claimed in claim 6, is characterized in that, the signal strength signal intensity of described transmission data is the total RSRP of LTE network and interfere information, or RSRQ;
Described data capacity information comprises the load information of neighbor base station, and the Un interface configuration information of return link between neighbor base station and RN;
Employing formula (3) calculates the return link available channel capacity between the plurality of neighbor base station and RN respectively:
C
i=g(MR
i) * min(config
i, (1-T
i) * DN), formula (3);
Wherein, MR
ibe the return link channel quality information between RN and i-th neighbor base station, the g(that RN reports) be spectrum efficiency according to each time slot corresponding to i-th return link channel quality information between neighbor base station with RN or throughput; T
iit is the load information of i-th neighbor base station; DN is the number of descending time slot in the current time slots configuration of i-th neighbor base station; Config
irepresent the number of the return link descending time slot in the Un interface configuration information of the return link between RN and i-th neighbor base station.
8. the method for claim 1, it is characterized in that, the method also comprises: RN arranges remote-controllable or automatic rotation antenna function, after selecting DeNB access, the antenna automatic rotation of this function control RN, is automatically rotated to the direction that the signal strength signal intensity that accepts DeNB is maximum.
9. select a system for the base station, donor cell of via node, it is characterized in that, this system handbag is drawn together: RN and target DeNB, wherein,
RN, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and detect with the return link channel quality information of the plurality of neighbor base station, after calculating the return link available channel capacity between the plurality of neighbor base station and RN respectively, neighbor base station that wherein return link available channel capacity is maximum is selected to access as the target DeNB of RN;
Target DeNB, for accessing RN.
10. system as claimed in claim 9, it is characterized in that, described system also comprises former DeNB, for obtaining the data capacity relevant information of the neighbor base station of the corresponding multiple neighbor base station identification informations received respectively, sends to RN;
RN, also meet for sending to former DeNB multiple neighbor base station identification informations that RN transmits the signal strength signal intensity requirement of data, receive from former DeNB and meet the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, before access target DeNB, disconnect the connection between former DeNB.
11. 1 kinds of devices selecting the base station, donor cell of via node, it is characterized in that, this device comprises: computing module, select module and access module, wherein,
Computing module, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and detect with the return link channel quality information of the plurality of neighbor base station, calculate the return link available channel capacity between the plurality of neighbor base station and RN respectively;
Select module, for selecting neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN;
Access module, for accessing target DeNB.
12. devices as claimed in claim 11, it is characterized in that, this device also comprises transceiver module, multiple neighbor base station identification informations that the signal strength signal intensity transmitting data for meeting RN to former DeNB transmission requires, receive from former DeNB and meet the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data;
Access module, also for before access target DeNB, disconnects the connection between former DeNB.
13. 1 kinds of systems selecting the base station, donor cell of via node, is characterized in that, comprising: RN, former DeNB and target DeNB, wherein,
RN, for send to former DeNB meet multiple neighbor base station identification information that signal strength signal intensity that RN transmits data requires and and RN between return link channel quality information; Under the instruction of former DeNB, disconnect the connection between former DeNB, access the target DeNB of corresponding target DeNB identification information;
Former DeNB, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and RN send with the return link channel quality information of the plurality of neighbor base station, after calculating the return link available channel capacity between the plurality of neighbor base station and RN respectively, select neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN, target DeNB identification information is sent to RN, and instruction RN accesses target DeNB;
Target DeNB, for accessing RN.
14. 1 kinds of devices selecting the base station, donor cell of via node, is characterized in that, comprise acquisition module, computing module, selection module and indicating module, wherein,
Acquisition module, for obtaining the data capacity relevant information of multiple neighbor base stations meeting signal strength signal intensity that RN transmits data and require respectively, and RN send with the return link channel quality information of the plurality of neighbor base station;
Computing module, for meeting according to obtaining respectively the data capacity relevant information that RN transmits multiple neighbor base stations of the signal strength signal intensity requirement of data, and RN send with the return link channel quality information of the plurality of neighbor base station, calculate the return link available channel capacity between the plurality of neighbor base station and RN respectively;
Select module, for selecting neighbor base station that wherein return link available channel capacity is maximum as the target DeNB of RN;
Indicating module, is used to indicate RN and disconnects access, access target DeNB.
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