CN101965035A - Method for selecting cell after failure of Backhaul link in relay system - Google Patents
Method for selecting cell after failure of Backhaul link in relay system Download PDFInfo
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- CN101965035A CN101965035A CN2010102787579A CN201010278757A CN101965035A CN 101965035 A CN101965035 A CN 101965035A CN 2010102787579 A CN2010102787579 A CN 2010102787579A CN 201010278757 A CN201010278757 A CN 201010278757A CN 101965035 A CN101965035 A CN 101965035A
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Abstract
The invention discloses a method for selecting a cell after a failure of a Backhaul link in a relay system, which mainly solves the problems of poor stability and low voice quality of a user in a Backhaul link recovering method performed in an original cell in the prior art. The method comprises the following implementation steps of: 1) after a relay detects the failure of a radio link, starting a T311 timer and starting to perform cell selection in a plurality of cells to which an original base station belongs; 2) recovering an access layer of the Backhaul link in a selected cell; 3) if the access layer is not recovered successfully, converting the state of radio resource control into an idle state; starting the T311 timer; and performing the cell selection in preconfigured base stations; and 4) recovering a non-access layer of the Backhaul link in the cell selected from the preconfigured base stations. By using the method, the relay can not only perform the cell selection in the original base station, but also can perform the cell selection in other preconfigured base stations, which expands a cell selection range, can recover the Backhaul link stably, and improves the voice quality of the user.
Description
Technical field
The invention belongs to wireless communication technology field, relate to a kind of system of selection of sub-district, can be used on Backhaul link in the relay system, promptly behind the link failure between relaying and the base station to the selection of sub-district.
Background technology
Modern communications is owing to be subjected to landform, and the influence of accident usually causes to be in that certain regional user can not get the excellent communications service in the sub-district, has introduced relaying for this reason and has solved this problem.The deployment of relaying has increased the power system capacity of overlay area, and can cover because calling quality is improved in the zone that is subjected to the landform restriction can't receive base station signal.Because relaying not only can be used as domestic consumer and also can be used as the base station, so the introducing of relaying also brought many problems, and wherein to fail once in a while be exactly a wherein comparatively outstanding problem to the Backhaul link.
Failure is a small probability event between the relaying of base station and subordinate, but the recovery problem after the failure must take in.At how recovering behind the Backhaul link failure in the relay system, at the 3GPP TSG in April, 2010 RAN WG2#69bis meeting, be on the 69th add-on conference of 3G (Third Generation) Moblie technical work group wireless access network the 2nd working group, the R2-102006 motion of general day company proposes a kind of system of selection based on the pre-configured Backhaul management entity of relaying, 3GPP TSG RAN WG2#70meeting in subsequently in May, 2010, be in the 70th meeting of 3G (Third Generation) Moblie technical work group wireless access network the 2nd working group, the R2-102771 motion of general day company compares detailed analysis to the method for this selection again.
The core of this scheme be thought be centering go on the row pre-configured, attempt then recovering in the base station under relaying.This scheme attempts disposing not only base station to a relaying, if behind the Backhaul link failure at this moment between relaying and the base station, at this moment the T310 timer can be provided with the longer time, relaying is tried one's best and former base station, and promptly the Access Layer recovery is carried out in the sub-district of the base station that is linked before the relaying Backhaul link failure.If also do not recover this moment, then attempt making Radio Link control resource to transfer idle condition to, make relaying attempt being connected with other base station, carry out the recovery of Non-Access Stratum.
This solution biggest advantage is exactly existing communication protocol to be changed less, and the information that only need be before relaying inserts will send to the base station to relaying is carried out pre-configured getting final product.Behind the Backhaul link failure, relaying is attempted carrying out link with former base station and is connected, and is less to the change on upper strata like this, consuming time less, minimum with the influence of communicating by letter between the user to relaying.
This relaying method for pre-configuration disadvantage is not consider those sub-districts that have the better link quality with current relaying.If link-quality is all unstable in a long time between the Radio Link of former base station and relaying, then the trial that links between relaying and the former base station is invalid often, even chained, also can cause the Backhaul link to be failed once more owing to the instability of link-quality, thereby just need recover once more, so not only wasted resource, and speech quality is also unstable for the user of current this relaying of use.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, propose the system of selection of sub-district behind the Backhaul link failure in a kind of relay system,, improve user's speech quality to realize stable recovery to the Backhaul link.
The technical scheme that realizes the object of the invention is: the centering capable base station of going on is pre-configured, carries out the selection of sub-district behind the Backhaul link failure, calculates and select sub-district in the former base station with the formula that proposes, and carries out the Access Layer recovery then.If Access Layer recovers not success, then calculate and select sub-district in the pre-configured base station with the formula that proposes, carry out the Non-Access Stratum recovery then.Concrete steps comprise as follows:
(1) relaying detects after the radio link failure, starts the T311 timer, and select the sub-district as follows in former base station:
1a) calculate the average signal-to-noise ratio Q of former sub-district respectively
2With the top-quality sub-district of lower channel, former base station average signal-to-noise ratio Q
4
1b) former base station cell channel quality step factor Δ Q is set
3
1c) according to described Q
2, Q
4With Δ Q
3, be calculated as follows the cell selecting signal-noise ratio threshold under the former base station:
Q
1＝Q
2+ΔQ
3-Q
4
1d) according to step 1c) result calculated selects the sub-district in former base station, work as Q
1Select former sub-district at＞0 o'clock, otherwise then select other sub-district of former base station;
(2) Access Layer that carries out the Backhaul link in the sub-district of selecting recovers, if Access Layer recovers successfully, then finishes the selection of sub-district, otherwise execution in step (3);
(3) state of Radio Resource control transfers idle condition to, starts the T311 timer, selects the sub-district in pre-configured base station:
3a) calculate the top-quality sub-district of lower channel, former base station average signal-to-noise ratio Q respectively
6With the top-quality sub-district of pre-configured lower channel average signal-to-noise ratio Q
8
3b) pre-configured BTS channel quality step factor Δ Q is set
7
3c) according to described Q
6, Q
8With Δ Q
7Be calculated as follows the cell selecting signal-noise ratio threshold of different pre-configured base stations:
Q
5＝Q
6+ΔQ
7-Q
8
3d) according to step 3c) result calculated selects the sub-district of different pre-configured base stations, works as Q
5Select the sub-district of the average signal-to-noise ratio maximum under the former base station at＞0 o'clock, otherwise then select the sub-district of other pre-configured base station;
(4) Non-Access Stratum that carries out the Backhaul link in pre-configured base station in the sub-district of selecting recovers.
The present invention has following beneficial effect:
The present invention is owing to adopt the technical scheme of selecting the sub-district and select the sub-district in former base station in pre-configured base station, carries out the Backhaul link restoring method in former sub-district and compares with having now, can stablize and recover the Backhaul link, and improve user's speech quality; Simultaneously since the present invention in the process of selecting the sub-district, cell selecting signal-noise ratio threshold formula that calculates under the former base station and the cell selecting signal-noise ratio threshold formula that calculates different pre-configured base stations have been designed, this formula has not only been considered former base station average signal-to-noise ratio, and considered the telephone traffic of selected sub-district, can make relaying not only can in former base station, carry out cell selecting like this, and can in other pre-configured base station, select the sub-district, expanded the scope of selecting the sub-district.
Description of drawings
Fig. 1 is a Backhaul link-recovery flow chart of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is further described.
With reference to Fig. 1, concrete steps of the present invention are as follows:
Step 1: relaying detects after the radio link failure, starts the T311 timer, selects the sub-district in former base station.
1a) calculate the average signal-to-noise ratio Q of former sub-district respectively
2With the top-quality sub-district of lower channel, former base station average signal-to-noise ratio Q
4, in the process of calculating signal to noise ratio, be not to calculate instantaneous signal to noise ratio, but being carried out filtering, the signal to noise ratio that receives calculates, the signal to noise ratio of calculating so just can reflect current quality of channel;
1b) former base station cell channel quality step factor Δ Q is set
3, Δ Q
3Setting be in order to consider the traffic carrying capacity of selected sub-district in the former base station, to be directly proportional with the traffic carrying capacity of selected sub-district, when selected cell business volume big more, Δ Q then
3The parameter value that is provided with is big more, and concrete parameter setting values need be when the actual arrangement website, after the data of actual conditions are surveyed, selects a former base station channel quality step factor;
1c) according to the average signal-to-noise ratio Q of the former sub-district of calculating
2, the top-quality sub-district of lower channel, former base station average signal-to-noise ratio Q
4With the former base station cell channel quality step factor Δ Q that is provided with
3, be calculated as follows the cell selecting signal-noise ratio threshold under the former base station:
Q
1＝Q
2+ΔQ
3-Q
4
1d) according to step 1c) result calculated selects the sub-district in former base station, work as Q
1Select former sub-district at＞0 o'clock, otherwise then select other sub-district of former base station.
Step 2: the Access Layer that carries out the Backhaul link in the sub-district of selecting recovers.
2a) start random access procedure, relaying sends the request of Radio Resource control connection to former base station, former base station is finished the request of replying the Radio Resource control connection by former base station to relaying after the radio-resource-configuration and is responded according to request application radio-resource-configuration after receiving request command;
2b) relaying carries out resource distribution after receiving the request response of Radio Resource control connection, and replys the Radio Resource control connection to the base station and finish information;
2c) base station receives after the Radio Resource control connection finishes information, by the contextual information deexcitation relay entity before the Backhaul link failure of preserving, and and relaying communicate, recover the Backhaul link, if Access Layer recovers successfully, then finish the selection of sub-district, otherwise execution in step (3).
Step 3: the state of Radio Resource control transfers idle condition to, starts the T311 timer, selects the sub-district in pre-configured base station.
3a) calculate the top-quality sub-district of lower channel, former base station average signal-to-noise ratio Q respectively
6With the top-quality sub-district of pre-configured lower channel average signal-to-noise ratio Q
8In the process of calculating signal to noise ratio, be not to calculate instantaneous signal to noise ratio, but being carried out filtering, the signal to noise ratio that receives calculates, the signal to noise ratio of calculating so just can reflect current quality of channel;
3b) pre-configured BTS channel quality step factor Δ Q is set
7Δ Q
7Setting be that it is directly proportional with the traffic carrying capacity of sub-district for the influence of the business of sub-district in other pre-configured base station of considering to be access in, if the traffic carrying capacity of sub-district is big more, Δ Q then
7The parameter value that is provided with is big more, and concrete parameter setting values need be surveyed the back to the data of actual conditions and select a pre-configured BTS channel quality step factor when the actual arrangement website;
3c) according to the top-quality sub-district of lower channel, the former base station average signal-to-noise ratio Q that calculates
6, the top-quality sub-district of pre-configured lower channel average signal-to-noise ratio Q
8With the pre-configured BTS channel quality step factor Δ Q that is provided with
7, be calculated as follows the cell selecting signal-noise ratio threshold of different pre-configured base stations:
Q
5＝Q
6+ΔQ
7-Q
8
3d) according to step 3c) result calculated selects the sub-district of different pre-configured base stations, works as Q
5Select the sub-district of the average signal-to-noise ratio maximum under the former base station at＞0 o'clock, otherwise then select the sub-district of other pre-configured base station.
Step 4: the Non-Access Stratum that carries out the Backhaul link in the sub-district of selecting recovers.
4a) relaying is initiated random access procedure, carries out the network attachment process;
After 4b) relaying was finished the network attachment process, the S1/X1 interface parameters between configuration relaying and the base station was set up the link of S1/X1 interface;
After 4c) link of S1/X1 interface was finished, relaying carried out Access Layer and recovers the Backhaul link.
Claims (3)
1. the system of selection of sub-district behind the Backhaul link failure in the relay system comprises the steps:
(1) relaying detects after the radio link failure, starts the T311 timer, and select the sub-district as follows in former base station:
1a) calculate the average signal-to-noise ratio Q of former sub-district respectively
2With the top-quality sub-district of lower channel, former base station average signal-to-noise ratio Q
4
1b) former base station cell channel quality step factor Δ Q is set
3
1c) according to described Q
2, Q
4With Δ Q
3, be calculated as follows the cell selecting signal-noise ratio threshold under the former base station:
Q
1＝Q
2+ΔQ
3-Q
4
1d) according to step 1c) result calculated selects the sub-district in former base station, work as Q
1Select former sub-district at＞0 o'clock, otherwise then select other sub-district of former base station;
(2) Access Layer that carries out the Backhaul link in the sub-district of selecting recovers, if Access Layer recovers successfully, then finishes the selection of sub-district, otherwise execution in step (3);
(3) state of Radio Resource control transfers idle condition to, starts the T311 timer, selects the sub-district in pre-configured base station:
3a) calculate the top-quality sub-district of lower channel, former base station average signal-to-noise ratio Q respectively
6With the top-quality sub-district of pre-configured lower channel average signal-to-noise ratio Q
8
3b) pre-configured BTS channel quality step factor Δ Q is set
7
3c) according to described Q
6, Q
8With Δ Q
7Be calculated as follows the cell selecting signal-noise ratio threshold of different pre-configured base stations:
Q
5＝Q
6+ΔQ
7-Q
8
3d) according to step 3c) result calculated selects the sub-district of different pre-configured base stations, works as Q
5Select the sub-district of the average signal-to-noise ratio maximum under the former base station at＞0 o'clock, otherwise then select the sub-district of other pre-configured base station;
(4) Non-Access Stratum that carries out the Backhaul link in pre-configured base station in the sub-district of selecting recovers.
2. cell selecting method according to claim 1, wherein the described Access Layer that carries out the Backhaul link in the sub-district of selecting of step (2) recovers, and carries out as follows:
2a) start random access procedure, relaying sends the request of Radio Resource control connection to former base station, former base station is finished the request of replying the Radio Resource control connection by former base station to relaying after the radio-resource-configuration and is responded according to request application radio-resource-configuration after receiving request command;
2b) relaying carries out resource distribution after receiving the request response of Radio Resource control connection, and replys the Radio Resource control connection to the base station and finish information;
2c) base station receives after the Radio Resource control connection finishes information, by the contextual information deexcitation relay entity before the Backhaul link failure of preserving, and and relaying communicate, recover the Backhaul link.
3. cell selecting method according to claim 1, wherein the described Non-Access Stratum that carries out the Backhaul link in the sub-district of selecting of step (4) recovers, and carries out as follows:
3a) relaying is initiated random access procedure, carries out the network attachment process;
After 3b) relaying was finished the network attachment process, the S1/X1 interface parameters between configuration relaying and the base station was set up the link of S1/X1 interface;
After 3c) link of S1/X1 interface was finished, relaying carried out Access Layer and recovers the Backhaul link.
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| CN 201010278757 CN101965035B (en) | 2010-09-09 | 2010-09-09 | Method for selecting cell after failure of Backhaul link in relay system |
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|---|---|---|---|
| CN 201010278757 CN101965035B (en) | 2010-09-09 | 2010-09-09 | Method for selecting cell after failure of Backhaul link in relay system |
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| Publication Number | Publication Date |
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| CN101965035A true CN101965035A (en) | 2011-02-02 |
| CN101965035B CN101965035B (en) | 2013-03-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014047772A1 (en) * | 2012-09-25 | 2014-04-03 | 华为技术有限公司 | Method, small cell, and mobile communication system for processing radio link failure |
| WO2021026704A1 (en) * | 2019-08-09 | 2021-02-18 | 华为技术有限公司 | Wireless communication method and device |
| CN114390615A (en) * | 2020-10-22 | 2022-04-22 | 展讯通信（上海）有限公司 | Wireless communication method and device, terminal and storage medium |
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| CN101489274A (en) * | 2008-01-16 | 2009-07-22 | 中兴通讯股份有限公司 | Wireless link recovery method and system |
| CN101803236A (en) * | 2007-08-08 | 2010-08-11 | 三星电子株式会社 | Apparatus and method for connecting radio link in wireless communication system having private network cell |
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2010
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Patent Citations (3)
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| CN101212775A (en) * | 2006-12-30 | 2008-07-02 | 华为技术有限公司 | Method and device for handling wireless link failures during switching process |
| CN101803236A (en) * | 2007-08-08 | 2010-08-11 | 三星电子株式会社 | Apparatus and method for connecting radio link in wireless communication system having private network cell |
| CN101489274A (en) * | 2008-01-16 | 2009-07-22 | 中兴通讯股份有限公司 | Wireless link recovery method and system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014047772A1 (en) * | 2012-09-25 | 2014-04-03 | 华为技术有限公司 | Method, small cell, and mobile communication system for processing radio link failure |
| CN103828419A (en) * | 2012-09-25 | 2014-05-28 | 华为技术有限公司 | Method, small cell, and mobile communication system for processing radio link failure |
| US9936426B2 (en) | 2012-09-25 | 2018-04-03 | Huawei Technologies Co., Ltd. | Processing method for radio link failure, small cell and mobile communication system |
| WO2021026704A1 (en) * | 2019-08-09 | 2021-02-18 | 华为技术有限公司 | Wireless communication method and device |
| CN113875314A (en) * | 2019-08-09 | 2021-12-31 | 华为技术有限公司 | Wireless communication method and device |
| CN114390615A (en) * | 2020-10-22 | 2022-04-22 | 展讯通信（上海）有限公司 | Wireless communication method and device, terminal and storage medium |
| CN114390615B (en) * | 2020-10-22 | 2023-04-14 | 展讯通信（上海）有限公司 | Wireless communication method and device, terminal and storage medium |
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| CN101965035B (en) | 2013-03-20 |
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