CN101778453B - Base station selection method and system - Google Patents

Abstract

Embodiments of the present invention relate to a base station selection method and system, wherein the base station selection method includes: a relay station obtains information related to multiple base stations; Selecting the serving base station of the mobile station; sending access request information to the selected serving base station; after the selected serving base station receives the access request information, the selected serving base station judges whether it becomes the The serving base station of the mobile station, if the selected serving base station judges that it cannot become the serving base station of the mobile station, the selected serving base station negotiates with other base stations in the plurality of base stations to reselect the serving base station. The above base station selection method and system select the serving base station of the mobile station through the RS according to the information of multiple base stations or select the serving base station of the mobile station through mutual negotiation between multiple base stations, thereby completing the MS under the network architecture of sharing the RS. access.

Description

Base station selection method and system

technical field

Embodiments of the present invention relate to communication technologies, and in particular to a method and system for selecting a base station.

Background technique

With the continuous development of communication technology, the requirements for various performances of the communication system, such as the access rate, are also constantly increasing. received people's attention. A communication system based on the Institute of Electrical and Electronics Engineers (IEEE) 802.16e standard is a BWA communication system.

Because the operating frequency of the 802.16e communication system is relatively high, the coverage of the base station (BS) is very limited. To this end, the 16j task group of the IEEE 802 working group is establishing a multi-hop wireless relay communication system standard, so that the new system can support a mobile station (mobile station, MS) based on the 802.16e standard through one or more relay stations. , RS) to communicate with BS.

Currently, the IEEE802.16m standard proposes a shared RS network architecture, that is, multiple base stations can share one RS. For example, the first base station (BS1) and the second base station (BS2) can share one RS. The network has the following Features: In order to coordinate the coverage of hotspots, if the traffic volume under RS is very large, the resources allocated by BS1 to RS are not enough, while BS2 has many resources that can be borrowed and reused. In order to balance the load, if the load of BS1 is heavy, and the load of BS2 is small, similar to frequency borrowing and multiplexing, frequency resources can be more fully utilized. In order to reduce equipment cost, fewer RSs can be used to simultaneously access multiple BSs. It can be seen that the use of the Shared RS network architecture can better optimize network coverage and reduce system costs.

However, no access procedure based on this network architecture is proposed in the existing standards. At present, there are two methods for the relay station to select the base station that the mobile station (MS) needs to access. The first method is that the MS detects the pilot sequence of the relay station, and the RS determines a BS according to the load, such as selecting a BS with a lighter load; The second method is that the MS detects the pilot sequence of the relay station and the base station, and the MS sends the access request to the RS, including the identified strongest preamble BS information, and selects the base station according to the above information.

However, the inventor found in the process of implementing the above-mentioned technical solution that: the above-mentioned solution only considers access control by the RS, and does not consider the participation of the BS in decision-making; During the access process, the serving base station of the MS is well selected.

Contents of the invention

Embodiments of the present invention provide a method and system for selecting a base station, so as to select a serving base station of the MS during the MS's access process in the case of RS sharing.

An embodiment of the present invention provides a method for selecting a base station, the method comprising:

The relay station obtains information related to a plurality of base stations;

The relay station selects the serving base station of the mobile station from the multiple base stations according to the information related to the multiple base stations;

sending access request information to the selected serving base station;

After the selected serving base station receives the access request information, the selected serving base station judges whether it becomes the serving base station of the mobile station, and if the selected serving base station judges that it cannot become the serving base station of the mobile station When the serving base station of the station is selected, the selected serving base station negotiates with other base stations in the plurality of base stations to reselect the serving base station.

An embodiment of the present invention provides a method for selecting a base station, which is used in a communication network, where the communication network includes at least one mobile station, a relay station, and multiple base stations, wherein the method for selecting a base station includes:

The multiple base stations receive the information sent by the relay station; the multiple base stations jointly negotiate according to the information, and select the serving base station of the mobile station; or,

After receiving the information sent by the relay station, some base stations in the plurality of base stations confirm that they cannot become the serving base station of the mobile station, negotiate with other base stations in the plurality of base stations, and select the serving base station of the mobile station.

An embodiment of the present invention provides a system for selecting a base station. The system includes a mobile station, a relay station, and multiple base stations, wherein the relay station is configured to send access request information of the mobile station to the multiple base stations;

The multiple base stations are configured to, after receiving the access request information sent by the relay station, negotiate according to the resource utilization status of the multiple base stations, and select the serving base station of the mobile station.

The above base station selection method and system select the serving base station of the mobile station through mutual negotiation among multiple base stations, thereby completing the access of the MS under the network architecture of sharing the RS.

Description of drawings

FIG. 1 is a flow chart of Embodiment 1 of a method for selecting a base station according to the present invention;

FIG. 2 is a signaling flow chart of Embodiment 1 of the method for selecting a base station according to the present invention;

FIG. 3 is a schematic structural diagram of Embodiment 1 of a base station selection device according to the present invention;

FIG. 4 is a schematic structural diagram of Embodiment 1 of the base station selection system of the present invention;

FIG. 5 is a flow chart of Embodiment 2 of the base station selection method of the present invention;

FIG. 6 is a signaling flow chart of Embodiment 2 of the base station selection method of the present invention;

7 is a schematic structural diagram of Embodiment 2 of the base station selection device of the present invention;

FIG. 8 is a schematic structural diagram of Embodiment 2 of the base station selection system of the present invention.

Detailed ways

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1, it is a flow chart of Embodiment 1 of the base station selection method of the present invention. In this embodiment, one RS is shared by multiple base stations. The base station selection method includes:

Step 101, obtaining information related to multiple base stations;

The RS obtains information related to multiple base stations, for example, the RS can obtain resource utilization information of multiple base stations; the RS can also receive the signal strength of multiple base stations, etc.; wherein, the RS receives the signal strength of multiple base stations through the following methods: RS Send a measurement request (Measurement-REQ) message to the MS, and the measurement request (RNG-REQ) message includes indication information that requires the MS to report the signal strength of multiple base stations, and the multiple base stations are identified by the identification information in the indication information Specify; the RS receives the signal strengths of the multiple base stations carried by the MS in the ranging request message; wherein, the MS reporting the signal strengths of the multiple base stations includes: the MS measures and reports the signal strengths of the multiple base stations; or the MS reports that the signal strengths of the multiple base stations have been measured The signal strength of multiple base stations; the above-mentioned identification information can be set according to needs, for example, it can be the preamble (Preamble) index (index) of each base station;

Step 102, selecting the serving base station of the MS according to the information related to the multiple base stations;

In the embodiment of the present invention, after the RS obtains the resource utilization information of multiple base stations, it can select the serving base station of the MS according to the resource utilization information of multiple base stations; or, after the RS obtains the signal strength of multiple base stations, it can select The serving base station of the MS is selected according to the signal strength of the multiple base stations; it is easy to understand that the serving base station of the MS may also be selected by comprehensively considering the signal strength and resource utilization information of the multiple base stations.

Step 103, when it is determined that the current base station cannot become the serving base station of the MS, negotiate with other base stations in the plurality of base stations, and select the serving base station of the MS.

This step is optional. Only when the current base station cannot become the serving base station of the MS, the current base station negotiates with other base stations among the multiple base stations to select the serving base station of the MS.

The above base station selection method can select the serving base station of the mobile station according to the information of multiple base stations. If the serving base station of the MS selected according to the information of multiple base stations cannot become the serving base station of the MS, a suitable one for the MS can be selected through negotiation between the base stations. The serving base station, thus completing the access of the MS under the network architecture of sharing the RS.

As shown in FIG. 2, it is a signaling flow chart of Embodiment 1 of the base station selection method of the present invention. This embodiment takes the first base station (BS1) and the second base station (BS2) sharing one RS as an example to illustrate the process of MS selecting a serving base station. process, which includes:

Step 201, RS broadcasts an uplink mapping message (UL-MAP);

Step 202, the MS sends a code division multiple access (CDMA) ranging code (code) to request uplink bandwidth;

Step 203, the RS sends a ranging reply (RNG-RSP) message to the MS;

After the RS receives the CDMA ranging code sent by the MS, it uses the initial ranging CID to send a RNG-RSP to the MS; the RNG-RSP may indicate "continue" and include UL transmission parameter correction information; after the MS receives the RNG-RSP, according to The UL transmission parameter correction information in the RNG-RSP adjusts the radio frequency (RF) signal until it is stable, randomly selects a code from the initial ranging CDMA ranging code, randomly selects a ranging time slot from the periodic ranging area, and sends The RS transmits the CDMA ranging code;

Step 204, the RS broadcasts the UL-MAP again;

Step 205, the MS sends the CDMA ranging code again;

Step 206, after the RS receives the CDMA ranging code, it replies to the RNG-RSP message;

The RNG-RSP message indicates "success", after step 206, may also include:

Step 207, the RS sends a measurement request (Measurement-REQ) message, which includes indication information requiring the MS to report the signal strengths of the first base station (BS1) and the second base station (BS2), and the indication information includes the BS1 preamble (Preamble ) index (index) and BS2 preamble index; BS/RS sends the preamble so that the access station (MS/RS) can synchronize with it. Each preamble has its index;

Wherein, the above indication information requiring the MS to report the signal strengths of BS1 and BS2 may also be included in the RNG-RSP message and sent by the RS;

Step 208, the RS broadcasts the UL-MAP, and allocates uplink bandwidth for the MS to send a correction request (RNG-REQ) message;

Step 209, the MS uses the initial ranging CID to transmit a RNG-REQ message on the allocated uplink bandwidth, and the message carries the MS MAC address and other information that needs to be reported for conventional ranging and the signal strength of BS1 and BS2;

The above-mentioned signal strength may be received signal strength (Received Signal Strength Indication, RSSI);

Step 210, the RS determines the serving base station of the MS;

The RS can decide whether the MS should access BS1 or BS2 according to the signal strengths of BS1 and BS2 reported by the MS in the RNG-REQ message, such as the RSSI of BS1 and the RSSI of BS2. When the RSSI of BS1 is greater than the RSSI of BS2, the RS decides that the MS should access BS1, otherwise, the RS decides that the MS should access BS2; or,

The RS decides which BS the MS should access according to the known information such as the resource utilization of BS1 and BS2; the method for the RS to obtain the known information is the same as that of the prior art, that is, there is no step 207 above, of course, the above step The RNG-REQ message in 209 also does not carry the signal strengths of BS1 and BS2; or;

The RS can decide which BS the MS should access according to the signal strength of BS1 and BS2 and their resource utilization;

In addition, the RS can also randomly determine which BS the MS should access according to needs;

Step 211, the RS forwards the MS's RNG-REQ message to BS1, but the message does not include the signal strengths of BS1 and BS2;

Here it is assumed that the RS decides that the MS should be connected to BS1;

Step 212, BS1 uses the initial ranging CID to send a RNG-RSP message to RS;

The RNG-RSP message carries the basic CID and primary management CID allocated for the MS. If the basic CID and primary management CID indicate "success", it indicates that the initial ranging process is over;

Step 213, when BS1 considers that it cannot become the serving BS of MS according to its own load, etc., then BS1 can negotiate with BS2 through the backbone network, and if BS2 can receive MS access, then BS2 replies RNG-RSP message to RS.

Step 214, the RS forwards the RNG-RSP message to the MS.

In the above base station selection method, the RS determines the serving base station of the mobile station, thereby completing the access of the MS under the network architecture of sharing the RS.

As shown in FIG. 3 , it is a schematic structural diagram of Embodiment 1 of the base station selection device of the present invention. The device includes: a receiving unit 11 for obtaining information related to multiple base stations; a selection unit 12 for communicating with multiple base stations according to the above The relevant information selects the serving base station of the MS.

In order to select the serving base station of the MS according to the resource utilization situation of the base station, the above receiving unit may include a first receiving module for obtaining resource utilization information of multiple base stations; the selection unit may include: a first selection module for according to the The resource utilization information of the multiple base stations is used to select the serving base station of the MS.

In order to select the serving base station of the MS according to the signal strength of the base station, the receiving unit may include: a sending module, configured to send a measurement request message to the MS, where the measurement request message includes indication information requiring the MS to report the signal strength of multiple base stations, so The multiple base stations are specified by the identification information in the indication information; the second receiving module is configured to receive the signal strengths of the multiple base stations carried by the MS in the ranging request message. The selection unit may include: a second selection module, configured to select a serving base station of the MS according to the signal strengths of the multiple base stations; or select a serving base station of the MS according to the signal strengths of the multiple base stations and resource utilization information.

In addition, the base station selection device may further include: a negotiating unit 13, configured to, when the serving base station of the MS selected by the selection unit 12 cannot become the serving base station of the MS, the serving base station of the selected MS and the base station among the plurality of base stations The other base stations negotiate to determine the serving base station of the MS.

Moreover, the above-mentioned apparatus for selecting a base station may be in an RS or other devices.

The above-mentioned base station selection device can select the serving base station of the mobile station according to the selection unit. If the serving base station of the MS selected by the selection unit cannot become the serving base station of the MS, the negotiation unit can be used to select the serving base station of the MS through negotiation between base stations, thereby completing The access of the MS under the network architecture of sharing the RS is realized.

As shown in FIG. 4, it is a schematic structural diagram of Embodiment 1 of the base station selection system of the present invention. The system includes a relay station 1, a mobile station 2, and a base station 3, wherein the above-mentioned relay station 1 is used to receive information related to multiple base stations 3, according to The above-mentioned information related to the plurality of base stations 3 selects the serving base station 3 of the above-mentioned mobile station 2 .

Wherein, the relay station also includes a base station selection device having the same structure as that of the first embodiment of the base station selection device of the present invention, which will not be described in detail here.

The above-mentioned base station selection system, through the interaction between the mobile station and the intermediate station, realizes that the RS can select the serving base station of the mobile station according to the information of multiple base stations, thereby completing the access of the MS under the network architecture of the shared RS; at the same time, When the selected serving base station of the MS cannot become the serving base station of the MS, selection of a more suitable serving base station is realized through negotiation between base stations.

As shown in FIG. 5, it is a flow chart of Embodiment 2 of the base station selection method of the present invention. In this embodiment, one RS is shared by multiple base stations. The method includes:

Step 301, receiving information sent by the relay station;

Before the base station receives the information sent by the relay station, the relay station obtains the information of multiple base stations reported by the MS, wherein the method for the relay station to obtain the information related to the multiple base stations is the same as the method for the relay station to obtain information related to multiple base stations in Embodiment 1 of the base station selection method of the present invention The methods for related information are the same, so I won’t go into details here;

Step 302: When it is determined that the current base station cannot become the serving base station of the MS according to the above information, negotiate with other base stations in the plurality of base stations to select the serving base station of the MS; or perform joint negotiation according to the above information to select the serving base station of the MS.

When at least one of the above-mentioned multiple base stations receives the access request sent by the relay station and determines that it cannot become the serving base station of the MS, it needs to negotiate with other base stations in the multiple base stations to select the serving base station of the MS; or, multiple After receiving the above information, the base stations conduct joint negotiation to select the serving base station of the MS.

This embodiment can specifically include the following situations:

The base station with the strongest signal strength receives the access request information sent by the relay station; when the base station with the strongest signal strength does not have enough resources to access the MS, it negotiates with other base stations among the multiple base stations to select the service of the MS base station; or,

The base station with the highest priority receives the access request information sent by the relay station; when the base station with the highest priority determines that it does not have enough resources to access the MS according to the access request information, and other base stations in the plurality of base stations Negotiate and select the serving base station of the MS; or,

The multiple base stations receive the access request information sent by the relay station; the multiple base stations negotiate according to the access request information, and select the serving base station of the MS.

In addition, when the negotiation between the above base stations is performed, the negotiation needs to be performed according to their respective loads and interference conditions; of course, the negotiation can also be performed based on other information.

In the above base station selection method, the serving base station of the mobile station is selected through mutual negotiation among multiple base stations, thereby completing the access of the MS under the network architecture of sharing the RS.

As shown in FIG. 6, it is a signaling flow chart of Embodiment 2 of the base station selection method of the present invention. In this embodiment, the first base station (BS1) and the second base station (BS2) share one RS as an example to illustrate the process of MS selecting a serving base station. process, which includes:

Step 401-step 409 are the same as step 201-step 209 in Embodiment 1 of the base station selection method of the present invention, and will not be repeated here;

Step 410, BS1 receives the RNG-REQ message sent by the relay station;

Wherein, the RNG-REQ message may include the signal strengths of BS1 and BS2; because the relay station here does not participate in decision-making, but only sends information related to the base station to the base station; if the RS does not send The signal strengths of BS1 and BS2 are sent to BS1, then in this step, the signal strengths of BS1 and BS2 can be included in the RNG-RSP message and sent to BS1;

Step 411, when BS1 cannot become the serving base station of the MS, negotiate with BS2 to select BS2 as the serving base station of the MS;

Step 412, BS2 sends the RNG-RSP message to RS;

Step 413, the RS sends the RNG-RSP message to the MS.

The base station selection method mentioned above enables the base stations to participate in the decision-making and select the serving base station of the mobile station through mutual negotiation among multiple base stations, thereby completing the access of the MS under the network architecture of sharing the RS.

As shown in FIG. 7 , it is a schematic structural diagram of Embodiment 2 of the base station selection device of the present invention. The device includes: a receiving unit 31 for receiving information sent by a relay station; a negotiation unit 32 for determining that the current base station cannot When becoming the serving base station of the MS, negotiating with other base stations among the multiple base stations to select the serving base station of the MS; or performing joint negotiation according to the information to select the serving base station of the MS.

Wherein, the base station selection device may be located in a base station or other equipment.

The above-mentioned base station selection device, through the negotiating unit, conducts mutual negotiation between multiple base stations so that the base stations participate in decision-making and select the serving base station of the mobile station, thereby completing the MS access under the network architecture of sharing the RS.

As shown in FIG. 8, it is a schematic structural diagram of Embodiment 2 of the base station selection system of the present invention. The system includes a mobile station 2, a relay station 1, and a base station 3, wherein the above-mentioned base station is used to receive information sent by the relay station, and when according to the When the information determines that it cannot become the serving base station of the MS, it negotiates with other base stations to select the serving base station of the MS; or, conducts joint negotiation according to the information and selects the serving base station of the MS.

Wherein, the base station also includes a base station selection device having the same structure as that of the second embodiment of the base station selection device of the present invention, which will not be described in detail here.

The above-mentioned base station selection system enables the base stations to participate in decision-making and select the serving base station of the mobile station through mutual negotiation among multiple base stations, thereby completing the access of the MS under the network architecture of sharing the RS.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be The scheme shall be modified or equivalently replaced without departing from the spirit and scope of the technical scheme of the present invention.

Claims (9)

1. A base station selection method, characterized in that, comprising: The relay station obtains information related to a plurality of base stations; The relay station selects the serving base station of the mobile station from the multiple base stations according to the information related to the multiple base stations; sending access request information to the selected serving base station; After the selected serving base station receives the access request information, the selected serving base station judges whether it becomes the serving base station of the mobile station, and if the selected serving base station judges that it cannot become the serving base station of the mobile station When the serving base station of the station is selected, the selected serving base station negotiates with other base stations in the plurality of base stations to reselect the serving base station. 2. The base station selection method according to claim 1, wherein said relay station obtaining information related to a plurality of base stations comprises: Sending a measurement request message to the mobile station, where the measurement request message includes indication information requiring the mobile station to report the signal strengths of the multiple base stations relative to the mobile station; The signal strength information of the plurality of base stations relative to the mobile station sent by the mobile station is received. 3. The base station selection method according to claim 1 or 2, wherein the selected serving base station negotiates with other base stations in the plurality of base stations, and reselecting the serving base station includes: The selected serving base station negotiates with other base stations in the plurality of base stations according to the signal strength information of the plurality of base stations relative to the mobile station, and the resource utilization information of the plurality of base stations, and reselects a service base station. 4. A method for selecting a base station, used in a communication network, comprising at least one mobile station, a relay station, and a plurality of base stations in the communication network, wherein the method for selecting a base station includes: The multiple base stations receive the information sent by the relay station; the multiple base stations jointly negotiate according to the information, and select the serving base station of the mobile station; or, After receiving the information sent by the relay station, some base stations in the plurality of base stations confirm that they cannot become the serving base station of the mobile station, negotiate with other base stations in the plurality of base stations, and select the service station of the mobile station. base station. 5. The method for selecting a base station according to claim 4, wherein the information sent by the relay station includes access request information and signal strength information for the plurality of base stations of the mobile station. 6. The base station selection method according to claim 5, wherein the plurality of base stations jointly negotiate according to the information, and selecting the serving base station of the mobile station comprises: The multiple base stations jointly negotiate according to the signal strength information and the resource utilization states of the multiple base stations, and select the serving base station of the mobile station. 7. The method for selecting a base station according to claim 6, wherein the plurality of base stations select the serving base station of the mobile station through joint negotiation based on the signal strength information and resource utilization states of the plurality of base stations themselves include: The multiple base stations jointly negotiate according to the information and the load and interference conditions of the multiple base stations, and select the serving base station of the mobile station. 8. A base station selection system, comprising a mobile station, a relay station and a plurality of base stations, characterized in that: The relay station is configured to send the access request information of the mobile station to the plurality of base stations; The multiple base stations are configured to, after receiving the access request information sent by the relay station, negotiate according to the resource utilization status of the multiple base stations, and select the serving base station of the mobile station. 9. The base station selection system according to claim 8, wherein the relay station also sends signal strength information of the multiple base stations relative to the mobile station to the multiple base stations, and the multiple base stations are based on The signal strength information and the resource utilization status of the multiple base stations are negotiated to select the serving base station of the mobile station. the

Images