WO2010085914A1

WO2010085914A1 - Method, system and device for transmitting the paging or control message under the condition of carrier aggregation

Info

Publication number: WO2010085914A1
Application number: PCT/CN2009/070339
Authority: WO
Inventors: 于映辉; 宋巍巍; 马慧
Original assignee: 华为技术有限公司
Priority date: 2009-02-02
Filing date: 2009-02-02
Publication date: 2010-08-05
Also published as: CN102172089B; CN102172089A

Abstract

A method, a system and an access network node for transmitting the paging or control message under the condition of carrier aggregation are provided in the embodiment of the present invention, the overhead of the paging signaling or control signaling is reduced. The method provided in the embodiment of the present invention includes the following steps: selecting a resident carrier for a user equipment UE; transmitting the paging message or control message through the resident carrier.

Description

Method, system and device for paging or control message transmission in carrier aggregation scenario

The present invention relates to the field of wireless communication technologies, and in particular, to a method, system, and apparatus for paging or controlling message transmission in a carrier aggregation scenario. Background technique

In order to further improve the spectrum efficiency and user throughput of the system, spectrum aggregation as a technology will be introduced into the Long Term Evolution (LTE) version R10. Carrier aggregation means that the user equipment UE can use multiple component carriers simultaneously. These multiple component carriers may be located under the same access network node, such that the number of accessible carriers under the same access network node is increased.

Paging technology is an important technology in wireless communication systems. Through paging, the network can find user terminals and initiate services to user terminals. After the UE is powered on, a camping cell is selected according to the criteria of the cell selection, and then an attach procedure is initiated on the cell. Through the process, the core network can know the cell that the UE currently initiates the call, and then confirm the UE attribution according to the location of the cell. Paging area. When the UE ends the attach procedure, the UE returns to the idle state. In the idle state, the UE may change the paging area, and at intervals, the UE will update the paging area. When the core network is looking for a UE, the core network first checks the paging area to which the UE belongs, and then sends a paging message to all access network nodes in the paging area, and then the next access network node goes down to the next. All cells send paging messages. In the process of implementing the present invention, the inventors have found that:

Since the UE may be camped on any carrier under the access network node when the UE is idle, when the paging message is sent to the access network node, the access network node needs to page to all the component carriers under it. The introduction of carrier aggregation technology requires the access node to send paging messages to more carriers, which leads to an increase in paging signaling overhead. Moreover, if the UE can receive control information on multiple component carriers, the UE needs to maintain multiple sets of signaling bearers of multiple component carriers, which will also result in an increase in control signaling overhead. Summary of the invention

The embodiment of the invention provides a method, a system and an access network node for sending paging or control messages in a carrier aggregation scenario, which can reduce the overhead of paging signaling or control signaling.

The embodiment of the invention is implemented by the following technical solutions:

A method for sending a paging or control message in a carrier aggregation scenario, comprising: selecting a resident carrier for a user equipment UE; and transmitting a paging message or a control message on the resident carrier.

Providing an access network node, including:

a selecting unit, configured to select a resident carrier for the user equipment UE;

And a sending unit, configured to send a paging message or a control message on the resident carrier.

A system for sending a paging or control message in a carrier aggregation scenario, including an access network node and a user equipment UE, where the access network node is configured to select a resident carrier for the user equipment UE, and Sending a paging message or a control message on the remaining carrier; the user equipment UE, configured to receive, on the resident carrier, a paging message or a control message sent by the access network node.

According to the technical solution provided by the foregoing embodiments of the present invention, by selecting a resident carrier for the user equipment UE, and sending a paging message or a control message on the resident carrier, the UE may be only on one carrier or a small number of The paging message or the control message is received on the carrier, so the overhead of paging signaling or control signaling can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are to be regarded as Other drawings may also be obtained from these drawings without the inventive labor.

FIG. 1 is a schematic diagram of a method for sending a paging or control message in a carrier aggregation scenario according to an embodiment of the present disclosure;

2 is a schematic structural diagram of an access network node according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another access network node according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of a system for sending a paging or control message in a carrier aggregation scenario according to an embodiment of the present invention. detailed description

The technical solutions provided by the present invention are further described in detail below with reference to the accompanying drawings and embodiments. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 1 , a method for sending a paging or control message in a carrier aggregation scenario according to an embodiment of the present invention includes:

Step 11: The access network node selects a resident carrier for the user equipment UE.

Step 12: The access network node sends a paging message or a control message on the resident carrier. The method for sending a paging or control message in a carrier aggregation scenario provided by the embodiment of the present invention, selecting a resident carrier for the user equipment UE by using an access network node, and sending a paging message or a control message on the resident carrier, so that The UE can receive paging messages or control messages on only one carrier or a small number of carriers, thus reducing the overhead of paging signaling or control signaling.

The access network node selects the resident carrier for the user equipment UE as follows:

The solution 1 selects a resident carrier for the UE according to a certain calculation method according to the identifier of the UE and the parameter related to the number of aggregated carriers. Calculation methods include:

(1) The UE's International Mobile Subscriber Identity (IMSI, International Mobile Subscriber Identity) or Temporary User I (IMSI: International Mobile Equipment Identity) or International Mobile Equipment Identity (IMEI: International Mobile Equipment Identity) or The global unique temporary identity (GUTI: global unique temporary identity) and the M phase division quotient or modulo M take the remainder, get the UE identification (ID), M>=1;

The value of the M is directly defined by a protocol or obtained from a core network. For example, M=1024, the UE ID is obtained according to IMSI mod M. Of course, M can also take other values greater than or equal to 1. (2) Taking the UE ID modulo N to obtain a carrier index, where N is a parameter related to the number of aggregated carriers, N>=1, that is, carrier index=(UE ID) mod N.

(3) Selecting a carrier corresponding to the carrier index as a resident carrier of the UE.

Using the calculation method provided by the scheme, the UE can be evenly distributed to each component carrier. For the UE side, the UE first obtains multi-carrier or carrier aggregation-related information from the network side, for example, the frequency of the component carrier, the identifier of the cell on the component carrier, and optionally, the bandwidth information of the component carrier or the number of component carriers or Frequency index, etc. These messages can be obtained by means of broadcast or dedicated signaling, where the dedicated signaling can be either access layer (AS) signaling or non-access stratum (NAS) signaling. The multi-carrier or carrier aggregation information provided by the network side may be network-specific, that is, network measurement planning, regardless of the situation of a single UE. It may also be UE-specific, and the aggregation information of different UEs is different according to the situation of the UE.

In this method, multiple carriers used for aggregation can be set to the same priority.

The UE calculates a carrier that the UE should camp according to the same calculation method described above. When the UE completes the calculation, it determines the carrier it is currently in. If the UE is not on the carrier that should be camped on, the UE needs to be switched to the carrier that should be camped on.

When the access network node sends a paging message or a control message to the UE on the selected carrier, the UE sends a response message on the uplink carrier corresponding to the component carrier.

If only some UEs support the carrier aggregation function, the access network node needs to first acquire the capabilities of the UE from the core network to support the carrier selection function described above. The capabilities of the UE may include the ability to support carrier aggregation or the ability to not support carrier aggregation. That is to say, the access network node needs to first obtain information from the core network that the UE supports or does not support carrier aggregation.

The method for the access network node to acquire the UE capability from the core network may be obtained by using a paging message, or may be obtained by a message from the core network to the access network node before.

If a high-capacity UE is required to reside only on a high-capacity carrier, then when calculating the number of carriers, only the number of high-capability member carriers can be calculated, which is the ability to support carrier aggregation techniques. Otherwise calculate the number of all member carriers. This will solve the system's Compatibility issue.

In the scheme 2, based on the priority of the component carrier, the resident carrier is selected for the UE according to a certain priority selection rule. Priority selection rules include:

When the component carrier has a dedicated priority, the component carrier with the highest priority is selected as the resident carrier of the UE;

When the component carrier has only a common priority, the component carrier with the highest common priority is selected as the resident carrier of the UE;

When only a part of the component carriers have a dedicated priority, the dedicated priority of the part of the component carriers is compared with the common priority of the other component carriers that do not have the dedicated priority, and the member carrier with the highest priority is selected as the resident of the UE. Carrier.

The aggregated component carriers can belong to different priorities, which are further divided into a common priority and a dedicated priority. For the priority, the access network node needs to obtain the priority from the core network, and the method for obtaining the priority may be obtained by using a paging message or by a message from the core network to the access network node.

In the case where only the common priority exists, when the received power levels of the plurality of component carriers are similar, the access network node transmits a paging message or a control message to the component carrier with the highest common priority.

After the access network node obtains the dedicated priority information of all component carriers, when the received power levels of the multiple component carriers are similar, the access network node sends a paging message or a control message to the component carrier with the highest priority priority.

In the case of a public and private mix, that is, if the access network node only obtains the dedicated priority information of a part of the component carriers, if a frequency has both a common priority and a dedicated priority, the value of the dedicated priority is taken only For the public priority, the value of the common priority is taken, and then the result is compared according to the obtained priority value, and then the access network node sends a paging message or a control message to the member carrier with the highest priority.

A specific digital example is used to illustrate: Suppose there are three component carriers: member carrier 1, component carrier 2, and component carrier 3, and member carrier 1 has a common priority and a dedicated priority of [12, 5], respectively. Member carrier 2 has a common priority and a dedicated priority of [4, 2], and component carrier 3 has only a common priority of 8, and a larger value indicates a higher priority level. According to the priority selection rule, the member carrier 1 is selected with a priority value of 5, the member carrier 2 is selected with a priority value of 2, and the member carrier 3 is selected with a priority value of 8. The access network node finally selects the member carrier 3 as the priority level. The highest member carrier.

For the UE side, according to the same priority selection rule as the access network node, the carrier that should be camped in the idle state of the UE is selected, and when the UE is selected, the current carrier is determined, if the UE is not in the UE On the carrier that should be camped on, the UE needs to be switched to the resident carrier.

In the scheme 3, the carrier released by the UE connection is selected as a resident carrier. This solution is a default choice for both network side and user side.

When the UE is powered on, it selects a cell to camp and initiates an attach procedure. After the attach process ends, the UE resides on the component carrier released by the connection.

The solution requires the access network node to obtain the carrier information when the UE connection is released from the core network, and the method may be obtained by using a paging message or by a message from the core network to the access network node before.

It should be noted that the UE may change the camped carrier in the idle state. After the UE moves, when the UE does not release the carrier where the connection is located, the UE must select another carrier to camp. Otherwise, The UE may not have a resident carrier. In this case, the access network node is required to re-select the resident carrier for the UE after transforming the resident carrier. For example, at the location of the access network node 1, the UE ends the call, and the carrier on which the connection is released is frequency 1. At the access network node 1, there are multiple carrier aggregations, which are frequency 1, frequency 2 and frequency 3. The access network node 2 is an adjacent node of the access network node, and the aggregated carriers used are frequency 2 and frequency 3, and no frequency 1. At the location where the UE accesses the network node 1, the carrier it camps on is frequency 1. When it moves to the location of access network node 2. Since the access network node 2 does not have a frequency of 1, the UE must update the resident carrier.

The method of re-selecting the resident carrier for the UE may use any one of the foregoing scheme 1 or scheme 2. When the method of the scheme 2 is used, the frequency at which the UE releases the service needs to be set to the highest priority frequency. The frequency priority setting can be a public priority or a dedicated priority. If it is a dedicated priority, a dedicated priority can be set when the connection is released. When using scenario 1, the network side can set multiple target carriers to the same priority.

In scheme 4, the carrier with the lowest frequency or the highest wireless coverage is selected as the resident carrier of the UE. This scheme is a default choice for the network side and the user side.

In the scenario of carrier aggregation, when the power is the same, the carrier of the low frequency will cover a larger area, and the network sets the carrier with the lowest frequency or the wireless coverage as the resident carrier, and the UE receives the paging message or control message on the carrier. .

As the UE moves, the low frequency carriers at different access network nodes may be different. At this time, the UE needs to change the resident carrier. For example, at the access network node 1, the low frequency carrier is frequency 1. When the UE moves to the access network node 2, the low frequency frequency may have changed to frequency 2, then the UE needs to change from camping to frequency 1 to Residing to frequency 2.

The frequency information of the carrier can be obtained by the UE by means of broadcast or dedicated signaling.

In the scenario 5, the network side directly sets the resident carrier of the UE. This solution is a default choice between the network side and the user side.

The network side directly sets the resident carrier of the UE, that is, the network and the UE respectively maintain a default configuration manner. Or the network side indicates the default resident carrier by broadcast message. Alternatively, the network passes a dedicated message indicating the default resident carrier. The indication that the default resident carrier can be one or more.

The dedicated message mentioned therein may be AS signaling, such as a connection release message, or other AS signaling. The dedicated message may also be NAS signaling, such as signaling or location update messages of the attach procedure, or paging messages.

As the UE moves, by reading the broadcast or receiving control signaling, if the UE finds that its default resident carrier has changed, the UE may change its resident carrier.

It should be noted that the above several solutions can be used alone or in combination with the UE. One or a smaller number of carriers are used as the resident carrier of the UE.

Referring to FIG. 2, based on the foregoing method embodiment, an embodiment of the present invention provides an access network node, including:

The selecting unit 21 is configured to select a resident carrier for the user equipment UE;

The sending unit 22 is configured to send a paging message or a control message on the resident carrier.

The selection unit 21 includes any of the following modules:

The identifier selection module 211 is configured to select a resident carrier for the UE according to the related identifier of the UE and a parameter related to the number of aggregated carriers; or

a priority selection module 212, configured to select a resident carrier for the UE based on a priority of the component carrier; or

The default selection module 213 is configured to select a default carrier as the resident carrier of the UE.

The default selection module 213 is specifically configured to select a carrier that is released by the UE connection or a carrier with a low frequency or a maximum radio coverage or a directly set carrier as a resident carrier of the UE.

When the selection unit 21 selects the resident carrier for the UE by using the default selection module 213, referring to FIG. 3, the access network node further includes:

The reselection unit 23 is configured to reselect the resident carrier for the UE when the UE transforms the resident carrier. The reselection unit 23 includes any of the following modules:

The identifier selection module 221 is configured to select a resident carrier for the UE according to the identifier of the UE and a parameter related to the number of aggregated carriers; or

a priority selection module 222, configured to select a resident carrier for the UE based on a priority of the component carrier; or

The default selection module 223 is configured to select a carrier with a low frequency or a maximum wireless coverage or a directly set carrier as a resident carrier of the UE.

The selection method of each of the foregoing selection modules may be applied to the calculation method or the priority selection rule provided by the foregoing method embodiments, and details are not described herein again. The access network node provided by the embodiment of the present invention selects a resident carrier for the user equipment UE by using the selecting unit, and the sending unit sends a paging message or a control message on the resident carrier, so that the UE can only be in one or more A paging message or a control message is received on a small number of carriers, so the overhead of paging signaling or control signaling can be reduced.

Referring to FIG. 4, based on the foregoing method embodiment, the embodiment of the present invention further provides a system for sending paging or control messages in a carrier aggregation scenario, including an access network node 20 and a user equipment 30.

The access network node 20 is configured to select a resident carrier for the user equipment UE, and send a paging message or a control message on the resident carrier;

The user equipment 30 is configured to receive, on the camping carrier, a paging message or a control message sent by the access network node.

Specifically, the access network node 20 is configured to select a resident carrier for the UE according to the identifier of the UE and a parameter related to the number of aggregated carriers; or select a station for the UE based on a priority of the component carrier. Leave the carrier; or, select the default carrier as the resident carrier of the UE.

The default carrier includes the carrier released by the UE connection. Or a carrier with a low frequency or wireless coverage, or a directly set carrier.

At this time, the user equipment 30 is configured to acquire carrier aggregation related information from the access network, and calculate, according to the calculation method that is the same as the access network node, a carrier that the UE should camp on, if If the UE is not on the carrier that should be camped, the UE needs to be switched to the carrier that should be camped; or, for selecting according to the same priority selection rule as the access network node, The carrier that the UE should camp on, if the UE is not on the carrier that should be camped on, the UE needs to be switched to the carrier that should be camped on.

When the UE transforms the resident carrier, the access network node 20 is further configured to reselect a resident carrier for the UE. The method for selecting a resident carrier for the UE may be: selecting a resident carrier for the UE according to a correlation identifier of the UE and a parameter related to the number of aggregated carriers; or selecting a resident carrier for the UE based on a priority of the component carrier. Or re-select the carrier with the lowest frequency or wireless coverage or the directly set carrier as the resident carrier of the UE. For the calculation method or the priority selection rule of the foregoing access network node for the UE to select the resident carrier, refer to the foregoing method embodiment, and details are not described herein again.

The meaning of the camped carrier in the embodiment of the present invention includes the carrier in which the UE camps in the idle state, and also includes the control carrier to which the active UE is connected. The control carrier includes a carrier that transmits control signaling of the physical layer, or a carrier that transmits higher layer control signaling.

Finally, it should be understood that those skilled in the art can understand that all or part of the process of implementing the above embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable. In the storage medium, the program, when executed, may include the flow of an embodiment of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium. The above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

The above specific embodiments are not intended to limit the present invention, and any modifications, equivalents, improvements, etc., which are included in the present invention, should be included in the present invention without departing from the principles of the present invention. Within the scope of protection.

Claims

Claim

A method for optimizing paging or control message transmission in a carrier aggregation scenario, which is characterized by:

Selecting a resident carrier for the user equipment UE;

A paging message or a control message is sent on the resident carrier.

The method according to claim 1, wherein the selecting the resident carrier for the user equipment UE comprises at least one of the following:

Selecting a resident carrier for the UE according to the identifier of the UE and a parameter related to the number of aggregated carriers; or selecting a resident carrier for the UE based on a priority of the component carrier;

Alternatively, the default carrier is selected as the resident carrier of the UE.

The method according to claim 2, wherein the selecting the default carrier as the resident carrier of the UE comprises:

Selecting a carrier that is released by the UE connection as a resident carrier of the UE;

Or selecting a low frequency carrier as the resident carrier of the UE;

Alternatively, the resident carrier of the UE is directly set.

The method according to claim 3, the directly setting the camped carrier of the UE comprises: the access network node retaining the configuration manner of the resident carrier, and indicating the broadcast message or a dedicated message Resident carrier.

The method according to claim 2, wherein the selecting a resident carrier for the UE according to the related identifier of the UE and a parameter related to the number of aggregated carriers includes:

The carrier identifier of the UE is obtained by taking the remainder of the modulo N, and the N is a parameter related to the number of aggregated carriers, N>=1;

The carrier corresponding to the carrier index is selected as a resident carrier of the UE.

The method according to claim 5, wherein the obtaining the carrier index by taking the remainder of the correlation identifier modulo N of the UE further comprises: Deriving the quotient of the UE's correlation identifier with the M, or taking the modulo M of the UE to obtain the UE identifier, and the value of the M is directly defined by the protocol or obtained from the core network, M>=1;

And determining, by the UE, the N number to obtain the carrier index.

The method according to claim 5 or 6, wherein the related identifier of the UE is: an international mobile subscriber identity, a temporary subscriber identity, an international mobile device identity code, or a globally unique temporary identifier. One.

The method according to claim 5, wherein before the step of selecting a resident carrier for the UE according to the identifier of the UE and the number of the aggregated carriers, the method includes:

The access network node acquires the capabilities of the UE from the core network, and the capabilities of the UE include the capability of supporting carrier aggregation or the capability of not supporting carrier aggregation.

The method according to claim 5, wherein the N is the number of component carriers supporting the carrier aggregation technology, or the N is the number of all component carriers.

The method according to claim 5, wherein before the step of sending a paging message or a control message on the specific camping carrier, the method includes:

The UE acquires carrier aggregation related information from the access network and resides on the resident carrier.

The method according to claim 2, wherein the selecting a resident carrier for the UE based on a priority of a component carrier includes:

When the component carrier has a dedicated priority, the component carrier with the highest priority priority is selected as the resident carrier of the UE;

When only a part of the component carriers have a dedicated priority, the dedicated priority of the part of the component carriers is compared with the common priority of the other component carriers that do not have the dedicated priority, and the member carrier with the highest priority is selected as the The resident carrier of the UE.

The method according to claim 11, wherein before the step of selecting a resident carrier for the UE based on the priority of the component carrier, the method includes: The access network node obtains the priority information of the component carrier from the core network.

The method according to claim 11, wherein before the step of sending a paging message or a control message on the specific camping carrier, the method includes:

The UE resides on the resident carrier.

The method according to claim 3, wherein before the step of selecting the default carrier as the resident carrier of the UE, the method includes:

The access network node obtains carrier information when the UE connection is released from the core network, or obtains the low frequency carrier information from the core network, or saves the configuration mode of the resident carrier.

The method according to claim 14, wherein if the UE transforms the resident carrier, the resident carrier is reselected for the UE.

The method according to claim 15, wherein the reselecting the resident carrier for the UE comprises:

Re-selecting a resident carrier for the UE according to a correlation identifier of the UE and a parameter related to the number of aggregated carriers; or reselecting a resident carrier for the UE based on a priority of the component carrier; or, using a low frequency carrier Or the directly set carrier is selected as the resident carrier of the UE.

17. An access network node, comprising:

The access network node according to claim 17, wherein the selecting unit comprises any one of the following modules: an identifier selecting module, configured to use, according to the related identifier of the UE and a parameter related to the number of aggregated carriers, The UE selects a resident carrier;

a priority selection module, configured to select a resident carrier for the UE based on a priority of the component carrier, and a default selection module, configured to select a default carrier as the resident carrier of the UE.

19. The access network node of claim 18, wherein

The default selection module is specifically configured to connect the UE to release a carrier or a low frequency carrier or The carrier set directly is selected as the resident carrier of the UE.

The access network node according to claim 19, wherein the access network node further comprises:

And a reselecting unit, configured to reselect the resident carrier for the UE when the UE transforms the resident carrier.

The access network node according to claim 20, wherein the reselection unit comprises any one of the following modules:

An identifier selection module, configured to select a resident carrier for the UE according to the identifier of the UE and a parameter related to the number of aggregated carriers; or

a priority selection module, configured to select a resident carrier for the UE based on a priority of the component carrier; or a default selection module, configured to select the low frequency carrier or the directly set carrier as the

The resident carrier of the UE.

A system for transmitting paging or control messages in a carrier aggregation scenario, comprising: an access network node and a user equipment UE,

The access network node is configured to select a resident carrier for the user equipment UE, and send a paging message or a control message on the resident carrier;

The user equipment UE is configured to receive, on the camping carrier, a paging message or a control message sent by the access network node.

23. The system of claim 22, wherein

The access network node is specifically configured to select a resident carrier for the UE according to the related identifier of the UE and a parameter related to the number of aggregated carriers; or select a resident for the UE based on a priority of the component carrier. Carrier; or, the default carrier is selected as the resident carrier of the UE.

24. The system of claim 23, wherein

The access network node is further configured to: when the UE transforms the resident carrier, reselect a resident carrier for the UE;

The user equipment UE is further configured to reside on the reselected resident carrier.