CN102088772B - Paging method and wireless network - Google Patents
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Abstract
The invention relates to the field of wireless communication, and discloses a paging method and a wireless network which are used for normally paging a terminal in the event that a relay station (RS) is set in the network. The method comprises: a base station (BS) or the RS carries out paging within the range of the BS or the RS and issues a paging message step by step after receiving the paging message from the terminal under an idle mode; the BS or the RS can directly issue the paging message to a lower-level RS after receiving the paging message from the terminal under the idle mode; the BS or the RS can also initiate paging within the coverage range of the BS or the RS, and then issues the paging message to the lower-level RS if a response message from the terminal is not received within a preset time limit; when the RS or the BS receives a location update or network reentry request from the lower-level RS or the terminal or the maximum paging count is reached, the RS or the BS stops issuing the paging message; and the RS can also stop issuing the paging message after receiving a paging stop message from a high-level RS or the BS.
Description
The invention is a division of Chinese patent application with application number 200610169148.3, named as paging method and wireless network, submitted to the Chinese patent office at 18.12.2006.
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a technique for controlling an idle mode terminal.
Background
As the demand for broadband wireless communication is increasing, the demand for wireless bandwidth is becoming greater and greater, and therefore higher and higher carrier frequencies are used in new protocols and wireless communication systems, however, since the attenuation of radio waves increases with the increase of frequencies, high carrier frequencies inevitably face the problem of high attenuation, and the use of high carrier frequencies limits the coverage of base stations. In addition, in the wireless communication system, the wireless communication signal strength is low in some areas due to the path attenuation of the electromagnetic wave or building obstruction, and the communication quality of the mobile terminal located in these areas is poor.
In order to increase the coverage area of the base station and improve the communication quality in the area with low signal strength, it is generally necessary to enhance the wireless communication signal between the base station and the mobile terminal by using the relay station. The relay station and the base station do not need wired transmission and only communicate through a wireless link, so the method has the advantages of low network deployment cost and simple deployment. Due to the special characteristics of some geographic environments (such as a long and narrow area), when the relay station is used for forwarding, a multi-hop transmission mode can be adopted by cascading a plurality of relay stations.
The structure of a multi-hop wireless communication system with relay stations is shown in fig. 1, in which a base station is connected with a core network through an optical cable or an electric cable, the coverage area of the base station is limited, and the area where the mobile terminal 1-4 is located cannot be directly covered, but the areas can be covered through the relay stations 1-4. Each relay station has no cable connection with the core network and the base station, wherein the relay stations 1 and 2 communicate with the base station through a wireless link, and the relay stations 3 and 4 do not have direct communication links with the base station but forward through the relay stations 2. For the mobile terminal 3, data transmission sent from the base station needs to go through 3 hops, the first hop is from the base station to the relay station 2, the second hop is from the relay station 2 to the relay station 3, and the third hop is from the relay station 3 to the mobile terminal 3. For convenience, the relay station 2 and the relay station 3 are referred to as first and second hop relay stations of the mobile terminal 3, respectively. In consideration of the service relationship between the base stations, the base station or the relay station that provides service for the next-hop relay station is referred to as a service station, for example, the base station is a service station of relay stations 1 and 2, and the relay station 2 is a service station of relay stations 3 and 4. If the base station and the relay station are regarded as nodes in the topology network, after the data transmission link is established, the serving relay station and the upper node of the relay station can be called as an upstream node of the relay station, and the nodes of the next hop of the relay station and the nodes serving the terminal can be called as downstream nodes.
The introduction of the relay station and its role are briefly introduced above, and the support of the idle mode of the terminal by the wireless communication system is explained below. Providing support for the idle mode of a terminal is an important function of a mobile communication system. In the idle mode, the terminal does not need to register to a specific base station, does not need to perform handover, and does not need to perform all conventional operation processes. Idle mode provides a mechanism so that the terminal can be paged periodically by the network side without breaking the network. Providing support for the idle mode of the terminal can greatly save the power consumption of the terminal and also save the resources of the system. Idle mode typically involves several procedures: the terminal enters an idle mode, the terminal performs location updating, the network side pages the terminal, and the terminal exits the idle mode. After the terminal finishes normal operation, the terminal can enter an idle mode; after entering the idle mode, position updating is required in the moving process so as to ensure that the network side can dynamically acquire the state and position of the terminal; when a terminal service arrives, a network side needs to initiate paging of the terminal and requires the terminal to exit an idle mode; after the terminal exits the idle mode, the network reentry can be carried out, and the terminal enters a normal mode.
Taking Worldwide Interoperability for microwave access (WiMAX) network as an example, four processes of the terminal entering the idle mode, the terminal performing location update, the base station paging the terminal, and the terminal exiting the idle mode will be specifically described.
The terminal enters an idle mode:
as shown in fig. 2, in step 201, the terminal sends a de-registration request (DREG-REQ) message to its serving base station, where the message includes a paging cycle, information that the idle mode needs to reserve for it, and the like, and may further include information such as a threshold value of the number of times of skipping a Media Access Control (MAC) hash address.
Then, step 203 is entered, the ASN-GW/PC/DPF on the network side responds to the data channel cancellation request sent by the base station, and sends a data channel release response.
Then steps 204 and 205 are entered, and the two steps have no fixed precedence relationship. In step 204, after receiving the data channel release response, the serving base station sends a de-registration command (DREG-CMD) to the terminal, where the de-registration command includes parameters such as paging parameters, anchor paging controller identifier, idle mode reservation information, and the like. In step 205, the serving base station returns a data channel release acknowledgement.
And after receiving the logout command, the terminal enters an idle mode.
And the terminal carries out position updating:
after the terminal enters the idle mode, location updating needs to be performed. Specifically, when a condition for updating the location of the terminal is triggered, or a message for notifying the terminal to perform location updating is received, a location updating process needs to be performed. The triggering conditions for updating the terminal position include the following four cases: the terminal enters a new paging area, the idle mode timer of the terminal is overtime, the terminal is powered off, and the Hash Skip Counter of the terminal exceeds the Hash Skip Threshold. When the condition of terminal location update is triggered, the terminal location update process is as shown in fig. 3:
in step 301, the terminal sends a location update request to its currently synchronized base station, which is carried by a ranging request (RNG-REQ) message, including an anchor paging controller identity.
Then, step 302 is entered, and the base station receiving the location update request of the terminal sends a location update request to the anchor paging controller of the terminal, wherein the location update request includes the identifier of the terminal, the identifier of the base station, and other necessary information.
Then, step 303 is entered, and the anchor paging controller sends a location update response to the corresponding base station after receiving the request.
After receiving the location update response, the base station then proceeds to steps 304 and 305, where there is no fixed precedence relationship between the two steps. In step 304, the base station generates location update response information, which is carried by a ranging response (RNG-RSP) message, including a location update status (success or failure), and if the location update is successful, paging information and other necessary information. In step 305, the base station returns a location update acknowledgement to the anchor paging controller.
Network side paging terminal:
when the trigger condition is satisfied, the anchor PC needs to send a Paging announcement (Paging announcement) to all base stations of the Paging group in which the terminal is currently located, so as to notify the base stations to send a Paging broadcast message or stop Paging. The trigger condition for the anchor PC to send the paging announcement is one of the following: data which needs to be sent to the terminal arrives; the network side needs to force the terminal to update the position; the network side needs to force the terminal to perform network reentry; the anchor PC learns that the terminal exits the idle mode and informs the relevant base station to stop paging.
If the anchor PC knows the addresses of the base stations in the relevant paging group, the anchor PC directly sends paging announcements to the base stations; otherwise, the paging announcement needs to be sent to the relevant base station through the relay pc (relay pc), as shown in fig. 4.
After receiving the paging announcement, each base station generates a paging message MOB _ PAG-ADV message if the paging announcement is not a command to stop paging, and broadcasts the paging message MOB _ PAG-ADV message in a paging listening interval (ListeningInterval) of the terminal. The physical frames in which the respective base stations transmit the paging message may be different in time as long as they are within the listening time interval of the terminal. The base station may transmit one to many Paging messages for the same terminal during a base station Paging Interval (Paging Interval). All Paging messages sent within a Paging interval are treated as a page, and the corresponding number of Paging retries (Paging retry count) is decremented by one, except that when the Action Code of a Paging message is set to No Action, i.e., when the Paging message is not operational, the number of Paging retries is not changed. When the number of times of paging retries is reduced to zero, the base station stops paging and considers that the terminal cannot obtain (unavailable), but the base station does not need to report the information of the terminal which cannot be obtained to the PC, and if the PC does not receive the paging success information reported by the base station all the time, the PC automatically considers that the terminal cannot obtain.
The relationship between several parameters during paging is shown in fig. 5. As can be seen, there is a period of time in each paging cycle for the terminal to listen for the time interval, and the base station must transmit the paging message in this period, which may also be referred to as the base station paging time interval.
The terminal exits the idle mode:
if there is service data to be sent to the terminal on the network side, a page will be sent to the terminal, and after the terminal receives the page, the idle mode should be ended in time, and the process of the terminal ending the idle mode is shown in fig. 6:
in step 601, after synchronizing to its current serving base station, the terminal sends a ranging request (RNG-REQ) message requesting to re-access the network.
Then, step 602 is entered, after receiving the request of accessing the network from the terminal, the base station sends a request for the information of the terminal to the ASN-GW/PC/DPF on the network side, where the request includes the necessary information such as the identifier of the terminal, the identifier of the base station, and the like.
Then, step 603 is entered, after receiving the request, the ASN-GW/PC/DPF on the network side generates a terminal information response, and sends the terminal information response to the corresponding base station, where the terminal information is included.
Then, step 604 is entered, and after receiving the response, the base station sends a ranging response (RNG-RSP) message to the terminal, so as to inform the terminal that the network re-entry is successful.
Then, step 605-.
The above description is about the process of the terminal entering and exiting the idle mode, performing location update in the idle mode, and paging the terminal in the idle mode on the network side, however, relay stations are added in many existing networks, and the existing technology cannot be directly applied to the multi-hop relay system.
Disclosure of Invention
The main technical problem to be solved by the embodiments of the present invention is to provide a paging method and a wireless network, so that a terminal can be paged normally even if a relay station is set in the network.
In order to solve the above technical problem, an embodiment of the present invention provides a paging method, including the following steps:
when a base station receives a paging message for paging a terminal in an idle mode, initiating paging in a coverage area of the base station, and forwarding the paging message to a subordinate relay station of the base station;
after receiving the paging message, the relay station initiates paging in the coverage area of the relay station, and if the relay station is not the last-stage relay station, the relay station continues to forward the paging message to the next-stage relay station of the relay station.
The embodiment of the invention also provides a wireless network, which comprises at least one base station and at least one relay station, wherein the base station further comprises:
a first paging unit paging the terminal within the coverage of the base station when receiving a paging message for paging the terminal in an idle mode;
a first transmitting unit for forwarding the received paging message to a subordinate relay station of the base station;
the relay station further includes: a second paging unit for initiating paging in the coverage area of the relay station after receiving the paging message;
and a second transmitting unit for forwarding the received paging message to a subordinate relay station of the relay station when the relay station is not the final relay station.
Compared with the prior art, the embodiments of the invention have the main differences and the effects that:
when receiving paging message of idle mode terminal, base station initiates paging in coverage area of base station, and forwards paging message to lower-level relay station; after receiving the paging message, the subordinate relay station initiates paging in the coverage area of the relay station, forwards the paging message to the subordinate relay station, and enables the terminal to be paged in the coverage areas of the base station and the relay station through issuing step by step and paging respectively, thereby ensuring that the terminal can successfully receive the paging message of the network side in any range.
After receiving the paging message of the idle mode terminal, the base station or the relay station can directly send the paging message to the subordinate relay station, so as to reduce the time occupied by sending the paging message and accelerate the speed of sending the paging message by the relay station; or, after receiving the paging message of the idle mode terminal, the base station or the relay station first initiates paging in the coverage area of the base station or the relay station, and if the response message of the terminal is not received within the preset time limit, the base station or the relay station sends the paging message to the lower relay station, so that unnecessary paging message is avoided being sent, the lower relay station carries out unnecessary paging, and the burden of the lower relay station is reduced.
When the relay station or the base station receives the position update or the network re-entry request from the subordinate relay station or the terminal, or the paging frequency reaches the maximum paging frequency, the relay station or the base station stops sending the paging message: the relay station can also stop sending down the paging message when receiving the paging stop message from the superior relay station or the base station. Therefore, once the terminal is determined to receive the paging or the paging is overtime, the base station or the relay station can stop the paging immediately, unnecessary paging operation is reduced, and network resources are saved.
The paging message sent by the base station or the relay station contains the number of times of paging, and the subordinate relay station determines the maximum paging number of the relay station according to the preset maximum paging number and the number of times of paging, so that the total paging number of the base station and the relay station does not exceed a preset threshold, and the time for the base station to wait for the paging response of the terminal is not too long.
Drawings
Fig. 1 is a schematic diagram of a wireless communication system including a relay station in the prior art;
fig. 2 is a flowchart of a terminal entering an idle mode in the prior art;
fig. 3 is a flowchart of a terminal performing location update in the prior art;
FIG. 4 is a flow chart of a prior art network-side paging terminal;
FIG. 5 is a diagram illustrating the relationship of paging parameters in the prior art;
fig. 6 is a flowchart of a terminal exiting an idle mode in the prior art;
fig. 7 is a flowchart of a paging method of a base station in a paging method according to a first embodiment of the present invention;
fig. 8 is a flowchart of a paging method of a relay station in a paging method according to a first embodiment of the present invention;
fig. 9 is a flowchart of a paging method of a base station in a paging method according to a second embodiment of the present invention;
fig. 10 is a flowchart of a paging method of a relay station in a paging method according to a second embodiment of the present invention;
fig. 11 is a flowchart of a method for a terminal to enter an idle mode according to a third embodiment of the present invention;
fig. 12 is a flowchart of a method of terminal location update according to a fourth embodiment of the present invention;
fig. 13 is a flowchart of a method in which a terminal exits an idle mode according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
When receiving paging message of idle mode terminal, base station initiates paging in coverage area of base station, and forwards paging message to lower-level relay station; after receiving the paging message, the subordinate relay station initiates paging in the coverage area of the relay station, forwards the paging message to the subordinate relay station, and enables the terminal to be paged in the coverage areas of the base station and the relay station through issuing step by step and paging respectively, thereby ensuring that the terminal can successfully receive the paging message of the network side in any range.
A first embodiment of the present invention will be described below, which relates to a paging method, and is a paging procedure of a base station as shown in fig. 7.
In step 701, when receiving a paging message of a terminal in an idle mode, a base station pages the terminal within a coverage area of the base station, broadcasts the paging message to all relay stations under the base station, and subtracts 1 from the maximum paging frequency of the terminal. The base station sends down the paging message belonging to the terminal in the paging monitoring time interval of the terminal, and the base station can send down the paging message once or for many times in the monitoring time interval.
When receiving the paging message from the network side, the terminal returns a paging response to the base station or the relay station that sent the paging message downward (that is, the terminal returns a paging response to the base station within the coverage of the base station and returns a response to the relay station within the coverage of the relay station), and when receiving the paging response of the terminal, the relay station of the subordinate of the base station reports the paging response to the base station. The paging response may be a location update request of the terminal, or a network re-entry request, etc. In conjunction with the above two points, in step 702, the base station waits for receiving the paging response of the terminal, and if the base station receives the paging response (including the reception from the terminal or the reception from the subordinate relay station) before the next paging listening time interval of the terminal arrives, step 706 is entered, otherwise, step 703 is entered.
In step 703, the base station determines whether the maximum paging frequency of the terminal is 0, and if so, proceeds to step 705; otherwise, step 704 is entered, the base station decreases the maximum paging number of the terminal by 1, and pages the terminal in the next paging listening time interval, and then step 702 is entered, the base station continues to wait for the paging response of the receiving terminal.
In step 705, when the maximum paging frequency of the terminal is 0, the base station still does not receive the paging response of the terminal, stops paging the terminal, considers that the terminal cannot be obtained, and ends the process. Or, considering the time delay required for the relay station to report the paging message, the terminal may stop paging, and continue to wait for a period of time, where the period of time may be the transmission time required from the relay station farthest from the base station to the base station, that is, the maximum transmission time of each relay station. And finally determining that the terminal cannot obtain the paging response if the terminal still does not receive the paging response of the terminal within the period of time.
In step 706, the base station receives the paging response from the terminal, reports the paging response to the PC, stops issuing the paging message, and issues a stop paging message to the subordinate relay station of the base station, where the stop paging message includes a stop paging identifier, so that each relay station can stop paging in time under the condition that the location of the terminal is determined, thereby reducing unnecessary paging operations and reducing the burden of the relay station. If the base station receives the paging response directly from the terminal, the base station sends a paging stop message to all subordinate relay stations, and if the base station receives the paging response from the subordinate relay stations, the base station sends the paging stop message to other subordinate relay stations except the subordinate relay stations.
In the present embodiment, the base station may receive the stop paging message from the network PC, and the base station needs to transfer the stop paging message to the relay station of its subordinate.
Fig. 8 shows a paging procedure of the relay station.
When receiving the paging message of the base station or the upper relay station, the relay station enters step 801, pages the terminal within the coverage of the relay station, reduces the maximum paging number of the terminal by 1, and if the relay station is not the last relay station, forwards the paging message to all the relay stations below the relay station. The relay station sends down the paging message belonging to the terminal in the paging monitoring time interval of the terminal, and the base station can send down the paging message once or for many times in the monitoring time interval.
Then, step 802 is entered, the relay station waits for receiving the paging response of the terminal, if the relay station receives the paging response of the terminal (including receiving from the terminal or receiving from the subordinate relay station) before the next terminal paging listening time interval arrives, step 803 is entered, the relay station stops issuing the paging message, reports the paging response to the superior relay station or the base station, and issues the stop paging message to the subordinate relay station, the stop paging message includes the stop paging identifier, so that each relay station and the base station can stop paging in time under the condition that the terminal position is determined, reduce unnecessary paging operation, and reduce the burden of the relay station, wherein, if the relay station directly receives the paging response from the terminal, the relay station sends the stop paging message to all the subordinate relay stations, if the relay station receives the paging response from the subordinate relay station, transmitting the stop paging message to other subordinate relay stations except the subordinate relay station; if the stop paging message from the base station or the superior relay station is received, step 804 is entered, the relay station stops issuing the paging message, and forwards the stop paging message to the inferior relay station; if neither the paging response nor the stop paging message is received from the terminal, step 805 is entered.
In step 805, the relay station determines whether the maximum paging frequency of the terminal is 0, if yes, step 806 is entered, the paging of the terminal is stopped, and the process is ended; otherwise, step 807 is entered, the relay station decreases the maximum paging number of the terminal by 1, and pages the terminal in the next paging listening time interval, and then step 802 is entered, the relay station continues to wait for receiving the paging response of the terminal or the stop paging message of the base station.
A second embodiment relates to a paging method, which is substantially the same as the first embodiment, except that in the first embodiment, when a base station or a relay station receives a paging message, it immediately sends the paging message to a subordinate relay station; in the present embodiment, the first embodiment is further optimized in view of the fact that the paging listening time interval of the terminal is relatively short, and there is a relatively long idle time between two paging listening time intervals, and in these idle times, the base station and the relay station cannot page the terminal in this time because the terminal does not listen to the paging channel. The basic idea of optimization is as follows: if the base station or the relay station receives the paging message in the paging listening time interval of the terminal and can perform paging in the paging listening time interval, but after the paging message is sent to the subordinate relay station, the subordinate relay station does not have time to perform paging in the paging listening time interval, that is, even if the base station or the relay station forwards the paging message to the subordinate relay station, the subordinate relay station still needs to wait until the next paging listening time interval arrives to send the paging message, so the base station or the relay station preferably does not forward the paging message to the subordinate relay station, first tries whether the paging response of the terminal can be received before the next paging listening time interval arrives, if the paging response can be received, does not need to forward the paging message to the subordinate relay station, and if the paging response cannot be received, forwards the paging message to the subordinate base station. Therefore, unnecessary paging messages are prevented from being issued, unnecessary paging is carried out by the subordinate relay station, and the burden of the subordinate relay station is reduced.
In addition, in the present embodiment, if the relay station is a last relay station, that is, if there is no subordinate relay station in the relay station, it is not necessary to perform a corresponding paging message and stop forwarding of the paging message.
Fig. 9 shows a paging procedure of the base station in the present embodiment.
In step 901, the base station receives a paging message from a PC.
Then, step 902 is entered, the base station determines whether the paging message needs to be forwarded immediately, that is, whether the subordinate relay station has to page the terminal within a current nearest paging listening time interval (e.g., a current paging listening time interval), and whether the subordinate relay station needs to wait until a next paging listening time interval to page the terminal if the paging message is to be forwarded immediately. If so, the paging message is required to be forwarded immediately, step 907 is entered, otherwise, the paging message is not required to be forwarded immediately, and step 903 is entered.
In step 903, the base station pages the terminal in the coverage area of the base station at the current latest paging listening time interval, and reduces the maximum paging frequency of the terminal by 1. Step 905 is then entered.
In step 905, the base station waits for a preset duration, which is less than or equal to a time difference between the time when the base station pages the terminal and the time when the next paging listening interval arrives.
Step 906 is entered, the base station judges whether the paging response of the terminal is received, if so, step 914 is entered, the base station stops paging, and the received paging response is reported to the PC; otherwise, go to step 907.
In step 907, the base station sets the paged number in the paging message, and adds 1 to the paged number.
Then, step 908 is executed, and the base station issues the configured paging message to the subordinate relay station.
In step 909, the base station determines whether the maximum paging number of the terminal is 0, if so, it proceeds to step 912, otherwise, it proceeds to step 910.
In step 910, the base station decreases the maximum paging number of the terminal by 1 and pages the terminal in the next paging listening interval.
Then, step 911 is entered, the base station waits for receiving the paging response of the terminal, and if the base station receives the paging response (including reception from the terminal or reception from the subordinate relay station) before the next paging listening time interval of the terminal comes, step 915 is entered, otherwise, step 909 is entered.
In step 912, the base station continues to wait for a period of time, which may be the transmission time required from the relay station farthest from the base station to the base station, i.e., the maximum transmission time of each relay station.
Step 913 is then entered, the base station determines whether the paging response of the terminal is received within the period of time, if so, step 915 is entered, otherwise, it is determined that the terminal cannot be obtained, and the process is ended.
In step 915, the base station stops paging the terminal, reports the received paging response to the PC, generates a stop paging message, and sends the stop paging message to the subordinate relay station, where the stop paging message includes a stop paging flag. If the base station receives the paging response directly from the terminal, the base station sends a paging stop message to all subordinate relay stations, and if the base station receives the paging response from the subordinate relay stations, the base station sends the paging stop message to other relay stations except the subordinate relay stations.
In addition, if the base station receives a stop paging message from the upper PC in the above procedure, it stops paging the terminal and forwards the stop paging message to its lower relay station.
Fig. 10 shows a paging procedure of the relay station in the present embodiment.
In step 1001, the relay station receives a paging message from an upper relay station or a base station.
Then, step 1002 is entered, the relay station obtains the paging times of the terminal from the paging message, and determines the actual maximum paging times of the relay station according to the preset maximum paging times and the paging times. The preset maximum paging frequency of the terminal may be subtracted from the paged frequency, and the difference is used as the actual maximum paging frequency of the relay station. If the terminal is not paged before, the paged times default to 0, and the maximum paging times preset by the relay station at the moment are the maximum paging times which the relay station can actually page the terminal; otherwise, the maximum time that the relay station can actually page the terminal is the difference between the preset maximum paging time and the paged time of the terminal. The actual paging times of the terminal can be controlled within a preset range by transmitting the paging times, so that the actual paging times are prevented from exceeding the preset maximum paging times, and the base station waits for the response of the terminal for a long time.
Steps 1003-1015 are similar to steps 902-914, except that the operation entity in steps 902-914 is the base station, and the base station reports the paging response to the PC when receiving the paging response, and the operation entity in steps 1003-1015 is the relay station, and the relay station reports the paging response to the base station when receiving the paging response.
In step 1016, the relay station receives the paging response of the terminal, the relay station stops issuing the paging message, reports the paging response to the upper relay station or the base station, and issues the stop paging message to the lower relay station, where the stop paging message includes a stop paging identifier, so that each relay station and the base station can stop paging in time when the location of the terminal is determined, thereby reducing unnecessary paging operations and reducing the burden of the relay station. If the relay station receives the paging response directly from the terminal, the base station sends a paging stop message to all relay stations of the subordinate level, and if the base station receives the paging response from the subordinate level relay station, the base station sends the paging stop message to other relay stations except the subordinate level relay station.
In addition, in this flow, if a stop paging message is received from a base station or an upper relay station before a relay station receives a paging response of a terminal, paging of the terminal is stopped, and the stop paging message is forwarded to a lower relay station thereof.
In the first and second embodiments, in order to support the base station and the relay station to transmit the paging message, stop the paging message, and set the number of times of paging, the original paging message needs to be modified, and the format of the modified paging message is shown in table 1. The method comprises the steps of modifying 6 reserved bits in an original message into 3 reserved bits, simultaneously utilizing 1 bit in the original message as a paging stop identifier to indicate whether paging is stopped or not, and indicating the number of times of paging of a terminal by using 2 bits, so that the sum of the number of times of sending paging messages by a base station and a subordinate relay station does not exceed the preset maximum paging number, and the time of waiting for paging response of the terminal by the base station is better controlled. The shaded portion in table 1 is a modification to the corresponding field of the MOB _ PAG-ADV message defined in the IEEE 802.16e protocol.
Paging message format (MOB _ PAG-ADV):
TABLE 1
A third embodiment of the present invention relates to a method for a terminal to enter an idle mode, in which a deregistration request of the terminal and a data channel withdrawal response of a base station are forwarded by a relay station, as shown in fig. 11.
In step 1101, the terminal sends a de-registration request (DREG-REQ) message to the relay station, where the message includes a paging cycle, information that the idle mode needs to reserve for the terminal, and the like, and may further include information such as a number threshold value for skipping a MAC hash address.
Then, in step 1102, the relay station sends the deregistration request message to the upper base station. In this process, the relay station may repackage the deregistration request message.
Then, step 1103 is entered, after receiving the message, the base station sends a data channel release request to the ASN-GW/PC/DPF on the network side, where the request includes information such as the identifier of the terminal (MSID), the identifier of the Base Station (BSID), and so on.
Then, step 1104 is entered, the ASN-GW/PC/DPF responds to the data channel cancellation request sent by the base station, and returns a data channel release response.
Then steps 1105 and 1107 are entered, which have no fixed precedence relationship.
In step 1105, after receiving the data channel release response, the base station returns a de-registration command (DREG-CMD) to the relay station, which includes parameters such as paging parameters, anchor PC id, idle mode reservation information, and then proceeds to step 1106.
In step 1106, the relay station returns the logout command to the terminal, so that the terminal can enter an idle mode after receiving the logout command.
In step 1107, the base station returns a data channel release acknowledgement to the ASN-GW/PC/DPF.
In the present embodiment, there may be one or a plurality of relay stations that perform forwarding.
A fourth embodiment of the present invention relates to a method for updating the location of an idle mode terminal, in which a relay station forwards a location update request of a terminal and location update response information of a base station, as shown in fig. 12.
In step 1201, the terminal transmits a location update request to the relay station, which is carried by a ranging request (RNG-REQ) message including an anchor PC identity.
Then, step 1202 is entered, and the relay station sends the location update request to the superordinate base station. In this process, the relay station may repackage the location update request.
Then, step 1203 is entered, where the base station receiving the terminal location update request sends a location update request to the anchor PC of the terminal, where the location update request includes the necessary information such as the terminal identifier, the base station identifier, and the like.
Then, in step 1204, the anchor PC sends a location update response to the corresponding base station after receiving the request.
After receiving the location update response, the base station then proceeds to steps 1205 and 1207, where there is no fixed precedence relationship between the two steps.
In step 1205, the base station generates location update response information, which is carried by a ranging response (RNG-RSP) message, including a location update status (success or failure), and if the location update is successful, paging information and other necessary information. The base station transmits the location response message to the relay station, and then proceeds to step 1206, where the relay station returns the location response message to the terminal.
In step 1207, the base station returns a location update confirmation to the anchor PC.
In the present embodiment, there may be one or a plurality of relay stations that perform forwarding.
A fifth embodiment of the present invention relates to a method for a terminal to exit an idle mode, in which a relay station forwards a ranging request (request for network re-entry) of the terminal and ranging response information of a base station, as shown in fig. 13.
In step 1301, the terminal transmits a ranging request (RNG-REQ) message to the relay station, requesting to re-access the network.
Then, in step 1302, the relay station transmits the ranging request message to the base station.
Then, step 1303 is entered, after receiving the request of accessing the network from the terminal, the base station sends a request for information of the terminal to the ASN-GW/PC/DPF on the network side, where the request includes necessary information such as the identifier of the terminal, the identifier of the base station, and the like.
Then, step 1304 is performed, after the ASN-GW/PC/DPF on the network side receives the request, a terminal information response is generated and sent to the corresponding base station, where the terminal information is included.
Then, the method proceeds to step 1305, where the base station sends a ranging response (RNG-RSP) message to the relay station after receiving the response.
Then, in step 1306, the relay station returns a ranging response message to the terminal, informing the terminal that the network re-entry is successful.
Then, step 1307-1309 is entered, the base station negotiates with the network side to establish a data channel for the terminal.
A sixth embodiment of the present invention relates to a wireless network including at least one base station and at least one relay station, the base station further including: a first paging unit, configured to initiate paging within a coverage area of the base station when receiving a paging message; and the first sending unit is used for forwarding the received paging message to a subordinate relay station of the base station. The relay station further includes: a second paging unit, configured to initiate paging within the coverage area of the relay station after receiving the paging message; and a second transmitting unit, configured to forward the received paging message to a relay station subordinate to the relay station, when the relay station is not a final relay station. The base station and the relay station respectively carry out paging in the coverage range of the base station and the relay station, and the terminal is ensured to be capable of successfully receiving the paging message of the network side in any range.
The first sending unit may directly forward the paging message to a subordinate relay station after receiving the paging message; or, not forwarding the paging message temporarily, including a first paging control unit in the base station, if the first paging control unit does not receive a response message of the terminal within a preset time limit after the first paging unit pages the terminal, the first paging control unit instructs the first sending unit to forward the paging message to the subordinate relay station; otherwise, the first paging control unit prohibits the first sending unit from forwarding the paging message to the subordinate relay station. Therefore, unnecessary paging messages are prevented from being issued, unnecessary paging is carried out by the subordinate relay station, and the burden of the subordinate relay station is reduced.
Similarly, the second sending unit may directly forward the paging message to the subordinate relay station after receiving the paging message, or may not forward the paging message temporarily, where the relay station includes a second paging control unit, and if a response message of the terminal is not received within a preset time limit after the second paging unit pages the terminal, the second paging control unit instructs the second sending unit to forward the paging message to the subordinate relay station; otherwise, the second paging control unit prohibits the second sending unit from forwarding the paging message to the subordinate relay station.
The first sending unit and the second sending unit page the terminal in the paging monitoring time interval of the terminal. The preset time limit is less than or equal to the time difference between the time interval from the starting of paging the terminal by the base station or the relay station to the next paging monitoring time interval, so that the paging of the terminal by the lower relay station is not delayed.
The base station further comprises: and a unit for sending a stop paging message to the subordinate relay station of the base station after receiving the paging response of the terminal, wherein the stop paging message comprises a stop paging identifier. The relay station further includes: a unit for forwarding the paging response to the superior relay station or the base station of the relay station after receiving the paging response of the terminal; a unit for sending a stop paging message to a subordinate relay station of the relay station, wherein the stop paging message includes a stop paging flag; and means for forwarding the stop paging message to a subordinate relay station of the relay station if the relay station is not a final relay station upon receipt of the stop paging message. Therefore, once the terminal is determined to receive the paging or the paging is overtime, the base station or the relay station can stop the paging immediately, unnecessary paging operation is reduced, and network resources are saved.
In this embodiment, the first paging unit stops paging the terminal in one of the following cases: receiving a paging response from a subordinate relay station or a terminal; or the base station pages the terminal for the maximum number of pages. The second paging unit stops paging the terminal in one of the following cases: receiving a paging response from a subordinate relay station or a terminal; or receiving a stop paging message from a superior relay station or a base station; or the relay station pages the terminal for the maximum number of pages. The maximum paging frequency can be a preset maximum paging frequency, or a difference between the preset maximum paging frequency and a paged frequency, or determined by adopting other algorithms according to the preset maximum paging frequency and the paged frequency. The latter can better ensure that the total paging times of the base station and the relay station do not exceed the preset threshold, so that the time for the base station to wait for the paging response of the terminal is not too long.
In summary, in each embodiment of the present invention, when receiving a paging message of an idle mode terminal, a base station initiates paging within a coverage area of the base station, and forwards the paging message to a lower-level relay station; after receiving the paging message, the subordinate relay station initiates paging in the coverage area of the relay station, forwards the paging message to the subordinate relay station, and enables the terminal to be paged in the coverage areas of the base station and the relay station through issuing step by step and paging respectively, thereby ensuring that the terminal can successfully receive the paging message of the network side in any range.
After receiving the paging message of the idle mode terminal, the base station or the relay station can directly send the paging message to the subordinate relay station, so as to reduce the time occupied by sending the paging message and accelerate the speed of sending the paging message by the relay station; or, after receiving the paging message of the idle mode terminal, the base station or the relay station first initiates paging in the coverage area of the base station or the relay station, and if the response message of the terminal is not received within the preset time limit, the base station or the relay station sends the paging message to the lower relay station, so that unnecessary paging message is avoided being sent, the lower relay station carries out unnecessary paging, and the burden of the lower relay station is reduced.
When the relay station or the base station receives the position update or the network re-entry request from the subordinate relay station or the terminal, or the paging frequency reaches the maximum paging frequency, the relay station or the base station stops sending the paging message: the relay station can also stop sending down the paging message when receiving the paging stop message from the superior relay station or the base station. Therefore, once the terminal is determined to receive the paging or the paging is overtime, the base station or the relay station can stop the paging immediately, unnecessary paging operation is reduced, and network resources are saved.
The paging message sent by the base station or the relay station contains the number of times of paging, and the subordinate relay station determines the maximum paging number of the relay station according to the preset maximum paging number and the number of times of paging, so that the total paging number of the base station and the relay station does not exceed a preset threshold, and the time for the base station to wait for the paging response of the terminal is not too long.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (18)
1. A method for paging, comprising:
a relay station receives a paging message sent by a base station, wherein the paging message is sent by the base station when the base station receives the paging message for paging a terminal in an idle mode;
after receiving the paging message, the relay station initiates paging in the coverage area of the relay station, and if the relay station is not a final-stage relay station, the relay station sends the paging message to a lower-stage relay station of the relay station;
the relay station stops paging the terminal in one of the following cases: receiving a paging response from a subordinate relay station of the relay station or the terminal; or receiving a stop paging message from a superior relay station of the relay stations or the base station; or the relay station pages the terminal for the maximum paging times, wherein the paging message contains the paged times of the terminal, and the relay station determines the maximum paging times of the relay station according to the preset maximum paging times and the paged times.
2. The method of claim 1, wherein the relay station directly transmits the paging message to a relay station subordinate to the relay station after receiving the paging message; or,
and after receiving the paging message, the relay station initiates paging in the coverage range of the relay station, if the response message of the terminal is not received in a preset time limit, the relay station sends the paging message to the subordinate relay station of the relay station, and otherwise, the relay station forbids to send the paging message to the subordinate relay station of the relay station.
3. The method according to claim 1 or 2, wherein the relay station pages the terminal within a paging listening time interval of the terminal.
4. The method according to claim 1 or 2, wherein the relay station receives the paging response directly from the terminal or indirectly through a subordinate relay station of the relay station;
after receiving the paging response, the relay station sends the paging response to a superior relay station of the relay station or the base station, and if the relay station is not a final relay station, sends a stop paging message to a subordinate relay station of the relay station, wherein the stop paging message comprises a stop paging identifier.
5. The method according to claim 1 or 2, wherein the relay station receives a stop paging message sent by the base station, the stop paging message is sent by the base station after receiving a paging response, the stop paging message includes a stop paging identifier, and the paging response received by the base station is directly received by the base station from the terminal or indirectly received through the relay station;
if the relay station is not a last relay station, the relay station forwards the stop paging message to a subordinate relay station of the relay station.
6. The method of claim 1, wherein the paging response is a location update request or a network re-entry request of the terminal.
7. A method for paging, comprising:
a base station receives a paging message for paging a terminal in an idle mode;
initiating paging in the coverage area of the base station and forwarding the paging message to a subordinate relay station of the base station;
the base station stops paging the terminal in one of the following cases: receiving a paging response from a subordinate relay station of the base station or the terminal; or the base station pages the terminal to the maximum paging times, wherein the paging message contains the paging times of the terminal, and the maximum paging times is determined according to the preset maximum paging times and the paging times.
8. The method of claim 7, wherein the base station directly sends the paging message to a subordinate relay station of the base station after receiving the paging message; or,
and the base station initiates paging in the coverage range of the base station after receiving the paging message, and if the response message of the terminal is not received within a preset time limit, the paging message is sent to a subordinate relay station of the base station, otherwise, the paging message is forbidden to be forwarded to the subordinate relay station of the base station.
9. The method according to claim 7 or 8, wherein the base station pages the terminal within a paging listening time interval of the terminal.
10. The method according to claim 7 or 8, wherein the base station receives the paging response directly from the terminal or indirectly through a subordinate relay station of the base station;
and after receiving the paging response, the base station sends a paging stopping message to a subordinate relay station of the base station, wherein the paging stopping message comprises a paging stopping identifier.
11. The method of claim 7, wherein the paging response is a location update request or a network re-entry request of the terminal.
12. A relay station, comprising:
a second paging unit for initiating paging in the coverage of the relay station after receiving a paging message sent by the base station, wherein the paging message is sent by the base station when receiving a paging message for paging a terminal in an idle mode; and the number of the first and second groups,
a second transmitting unit that transmits the received paging message to a relay station subordinate to the relay station when the relay station is not a final relay station;
the second paging unit stops paging the terminal in one of the following cases: receiving a paging response from a subordinate relay station of the relay station or the terminal; or receiving a stop paging message from a superior relay station of the relay stations or the base station; or the relay station pages the terminal for the maximum paging times, wherein the paging message contains the paged times of the terminal, and the relay station determines the maximum paging times of the relay station according to the preset maximum paging times and the paged times.
13. The relay station of claim 12, wherein the relay station further comprises a second paging control unit configured to: if the response message of the terminal is not received within the preset time limit after the second paging unit pages the terminal, the second sending unit is instructed to send the paging message to the lower relay station of the relay station; and if not, forbidding the second sending unit to send the paging message to the subordinate relay station of the relay station.
14. The relay station of claim 12, wherein the relay station further comprises:
a unit for sending the paging response to the superior relay station of the relay station or the base station after receiving the paging response of the terminal; and
and a unit for transmitting a stop paging message to a relay station subordinate to the relay station, wherein the stop paging message includes a stop paging flag.
15. The relay station of claim 12, wherein the relay station further comprises:
and a unit for transmitting the stop paging message to a lower relay station of the relay station if the relay station is not the last relay station upon receiving the stop paging message transmitted from the base station.
16. A base station, comprising:
a first paging unit paging the terminal within the coverage of the base station when receiving a paging message for paging the terminal in an idle mode;
a first transmitting unit that transmits the received paging message to a subordinate relay station of the base station;
the first paging unit stops paging the terminal in one of the following cases: receiving a paging response from a subordinate relay station of the base station or the terminal; or the base station pages the terminal to the maximum paging frequency, wherein the paging message contains the paging frequency of the terminal, and the maximum paging frequency is determined according to the preset maximum paging frequency and the paging frequency.
17. The base station of claim 16, wherein the base station further comprises a first paging control unit configured to: if the response message of the terminal is not received within the preset time limit after the first paging unit pages the terminal, the first sending unit is instructed to send the paging message to a subordinate relay station of the base station; and if not, forbidding the first sending unit to send the paging message to a subordinate relay station of the base station.
18. The base station of claim 16, wherein the base station further comprises: and a unit for sending a paging stop message to the subordinate relay station of the base station after receiving the paging response of the terminal, wherein the paging stop message comprises a paging stop identifier.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592480A (en) * | 2003-08-12 | 2005-03-09 | 诺基亚公司 | Arrangement and method for paging, cellular radio system |
| CN1802011A (en) * | 2005-01-05 | 2006-07-12 | 华为技术有限公司 | Method and system for realizing paging in wireless communication system |
| CN1842207A (en) * | 2005-03-31 | 2006-10-04 | 西门子（中国）有限公司 | Distributed multihop wireless network access method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592480A (en) * | 2003-08-12 | 2005-03-09 | 诺基亚公司 | Arrangement and method for paging, cellular radio system |
| CN1802011A (en) * | 2005-01-05 | 2006-07-12 | 华为技术有限公司 | Method and system for realizing paging in wireless communication system |
| CN1842207A (en) * | 2005-03-31 | 2006-10-04 | 西门子（中国）有限公司 | Distributed multihop wireless network access method |
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