WO2007006174A1

WO2007006174A1 - A method of channel allocation in wcdma mobile communication system

Info

Publication number: WO2007006174A1
Application number: PCT/CN2005/001010
Authority: WO
Inventors: Lingling Zeng; Yazhu Ke
Original assignee: Zte Corporation
Priority date: 2005-07-08
Filing date: 2005-07-08
Publication date: 2007-01-18
Also published as: CN101171780B; CN101171780A

Abstract

A method of channel allocation in WCDMA mobile communication system, comprises the following steps: a) after initiating radio access bearer service establish request in core network, a radio network controller preliminarily allocates the channel is public transmission channel, or high speed downlink shared channel or dedicated channel according to a current radio resource control condition of a mobile terminal and a quality requirement of new service; b) finally allocating the type of the transmission channel according to the capability of the mobile terminal and the resource condition of the system, therefore the compatibility between the requirement of QoS, and the capability of the mobile terminal and the system resource an be made much better, and allocating the best transmission channel for a new calling service. The invention can satisfy the current RRC state and capability of the UE, the service characteristic and the transmission channel characteristic, and congestion states of various system resources. The invention allocates the optimal type of transmission channel to the new calling service. The system resource is sufficiently utilized on the premise that the service QoS is guaranteed.

Description

Channel allocation method for WCDMA mobile communication system

The method of the present invention relates to a channel allocation method for a Wideband Code Division Multiple Access (WCDMA) mobile communication system. Background technique

In the third generation mobile communication system, the main part of the control signaling between the mobile terminal UE User Equipment) and the radio access network RAN (Radio Access Network) is a Radio Resource Control (RRC) message. From the perspective of the RRC layer, the basic operation mode of the UE is divided into an idle mode and a connected mode, and the connection mode can be further divided into different service states, including: CELL-DCH, CELL-FACH, CELL_PCH, and URA-PCH states, as shown in FIG. . These traffic states define the type of physical channel used by the UE. In the CELL_DCH (Dedicated Channel) state, the RAN needs to allocate a dedicated physical channel to the UE. In the CELL_FACH (Forward Link Access Channel) state, the UE does not occupy the dedicated physical channel, and uses RACH (Random Access Channel) and FACH common channel to transmit signaling messages and a small number of user planes. data. In the CELL-PCH (Paging Channel) state, the RAN contacts the UE through the PCH.

On the other hand, UMTS (Universal Mobile Telecommunication System) provides various service services for mobile terminals. In order to implement the end-to-end service, the core network CN (Core Network) requires the radio network controller RNC (Radio Network Controller) to establish a radio access bearer RAB (Radio Access Bearer) for service bearer. The RAB is divided into Iu. (Interface between the RNC and the CN) bearers and the radio bearer RB (Radio Bearer) between the RAN and the UE, as shown in FIG. 2, that is, according to the RAB request of the upper-level network node, the RRC of the RNC needs to perform wireless The establishment of the bearer and other operations. In the process of establishing a wireless bearer, the RNC first selects the type of transport channel and then configures the radio bearer parameters of the transport channel and the physical channel.

Different services can select different transmission channels for radio bearer. The network side allocates a suitable transmission channel for the new call according to the QoS (Quality of Service) feature of the service and the real-time operation of the network resource. The transmission signal is divided into a common transmission channel and a dedicated transmission channel. Common channel resources can be allocated and used by all users or a group of users in a cell, while dedicated channel resources are reserved only for a single user. Currently, there are a variety of methods for selecting a common transport channel and a dedicated transport channel.

However, the HSDPA technology introduces a shared transport channel HS-DSCH (High Speed Downlink Shared Channel). HS-DSCH is a transmission signal used to transmit dedicated user data and control channels.

1

Confirmation Channels are shared by multiple users in a time division or code division multiplexing manner. It should be noted that the introduction of the HS-DSCH does not extend the RRC state of the UE. If the HS-DSCH is started, the UE is still in the CELL-DCH state.

Thus, three types of transport channels are available for allocation: common channel, dedicated channel, and HS-DSCH shared channel. Therefore, it is necessary to provide a suitable method to solve the channel allocation problem. Summary of the invention

The object of the present invention is to provide a channel allocation method for a WCDMA mobile communication system, so that the RNC can optimize the transmission channel selection according to the UE RRC state, the service QoS characteristics, the UE capability, and the system resource consumption, and fully utilize various systems. Resources to improve resource utilization of the RAN system.

The technical solution of the present invention is as follows:

A channel allocation method for a WCDMA mobile communication system, comprising the steps of:

a) After the core network initiates the radio access bearer service setup request, the radio network controller initially allocates whether it is a common transport channel, a high speed downlink shared channel, or a dedicated channel according to the current radio resource control state of the mobile terminal and the new service quality requirement. ;

b), according to the mobile terminal capability and the resource condition of the system, the final allocation of the transmission channel type to balance the service quality requirement, the mobile terminal capability and the system resource, and allocate an optimal transmission channel for the new call service.

The method, wherein the step a) further comprises:

Al), setting a mapping table of radio resource control states, service quality of service, and transport channel types of the mobile terminal;

A2) Select an initial allocation type of the transport channel according to the mapping relationship table.

The method, wherein the step b) further includes

Bl) If the initial allocation type is a common transmission channel, a common resource congestion decision is performed. If the resource is sufficient, the final allocation result is a common transmission channel; if the common resource is congested, the high-speed downlink shared channel shared resource allocation decision is performed.

The method, wherein the step b) further comprises:

B2) If initially allocated as a high-speed downlink shared channel, perform a mobile terminal capability-related decision to determine whether the mobile terminal supports the high-speed downlink shared channel and whether the mobile terminal service concurrent capability is sufficient; if the mobile terminal has sufficient capability, then idle downlink Shared resource congestion decision of the shared channel; otherwise, a dedicated transport channel resource allocation decision is made;

B3), a shared resource congestion decision of the high speed downlink shared channel, where the shared resource includes the number of users, downlink transmit power, and throughput; if the resource is sufficient, the final allocation result is: a high speed downlink shared channel; Plug, then perform a dedicated transport channel resource allocation decision.

The method is characterized in that the step b) further comprises:

B4) If the initial allocation type is a dedicated transport channel, the mobile terminal capability related decision is performed according to the transport channel bearer condition of the mobile terminal activated service, including: whether the mobile terminal service concurrency capability is sufficient; if the mobile terminal capability is insufficient, the entry is Step b5); otherwise, directly enter step b6);

B5), uniformly allocating DCH bearers for the following services: using activated services and new services carried by the high-speed downlink shared channel;

B6) performing a dedicated resource congestion decision, where the dedicated resource includes a downlink channelization code, a downlink transmission power, and an uplink interference; if the resource is sufficient, the channel allocation is successful, and the final allocation result is: a dedicated transmission channel; if the dedicated resource is congested, The transmission channel assignment failed and the service establishment failed.

The present invention provides a channel allocation method for a WCDMA mobile communication system. The RNC provides a common transport channel, an HS-DSCH shared channel, and a radio bearer according to the current RRC state of the UE, the QoS characteristics of the new service, the UE capability, and the system resource consumption. The dedicated transmission channel performs optimized channel allocation and selection, and fully utilizes various resources of the system; the method of the present invention can simultaneously consider the current RRC state and capability characteristics of the UE, the characteristics of services and transmission channels, and the congestion of various resources of the system. Allocate the optimized transport channel type for the new call service, and make full use of the system resources under the premise of guaranteeing service QoS. DRAWINGS

1 is a schematic diagram of a UE mode and a connection mode in the prior art;

2 is a schematic diagram of a prior art radio bearer;

FIG. 3 is a schematic diagram of a specific embodiment of the technical solution of the present invention. detailed description

The specific embodiments of the technical solution of the present invention are described in detail below with reference to the accompanying drawings. The basic principle of the channel allocation method of the WCDMA mobile communication system of the present invention is: After receiving the RAB service establishment request initiated by the CN, the radio network controller RNC first according to the UE The current RRC state and the new service QoS requirement, the initial decision is to allocate the common transport channel, the HS-DSCH shared channel or the dedicated channel; then, the final allocation of the transport channel type is performed according to the UE capability and the resource condition of the system. In this way, the service QoS requirements, UE capabilities and system resources are taken into account, and the optimal transport channel is allocated for the new call service.

The steps of the optimized channel allocation method described in the channel allocation method of the WCDMA mobile communication system of the present invention are as follows, as shown in FIG. 3: Step 1: The RNC performs initial allocation of the transport channel type according to the current RRC state of the UE and the service QoS.

Step 2: The RNC performs the final allocation of the transport channel type according to the UE capabilities and system resources.

The first step further includes specific steps:

It should be noted that, according to the RRC protocol, after the RNC receives the CN-initiated RAB service setup request, the current UE's RRC state must have been migrated to CELL-FACH or CELL_DCH, and not CELL_PCH and IDLE.

(102) Select an initial allocation type of the transport channel according to the mapping table.

The second step includes:

(201) If initially allocated as a common transport channel, a common resource congestion decision is made. Public resources include RACH interference, FACH throughput, and more. If the resources are sufficient, the final allocation result is: a common transport channel; if the common resource is congested, an HS-DSCH shared resource allocation decision is performed (shown in step 202).

(202) If the HS-DSCH shared channel is initially allocated, the UE capability-related decision is performed, including: whether the UE supports the HS-DSCH, and the UE service concurrent (the concurrent DCH service and the HS-DSCH service) capability is sufficient. If the UE capability is sufficient, the HS-DSCH shared resource congestion decision is performed (shown in step 203); otherwise, the dedicated transport channel resource allocation decision is performed (shown in step 204).

(203) HS-DSCH shared resource congestion decision. Shared resources include the number of users, downlink transmit power, throughput, and so on. If the resources are sufficient, the final allocation result is: HS-DSCH shared channel; if the shared resource is congested, a dedicated transport channel resource allocation decision is performed (shown in step 204).

(204) If initially allocated as a dedicated transport channel, the UE capability related decision is performed according to the transport channel bearer condition of the UE activated service, including: whether the capability of the UE service concurrent (concurrent DCH service and HS-DSCH service) is sufficient. If the capability is insufficient, then go to step 205; otherwise, go directly to step 206.

(205) The DCH bearers are uniformly allocated for the following services, which include: Activated services and new services carried by the HS-DSCH.

(206) Perform a dedicated resource congestion decision. The dedicated resources include: downlink channelization code, downlink transmit power, uplink interference and other factors. If the resources are sufficient, the channel allocation is successful, and the final allocation result is: a dedicated transport channel; if the dedicated resource is congested, the Bay transmission channel allocation fails, and the service establishment fails. FIG. 3 is a schematic diagram of a specific embodiment of channel allocation in a WCDMA system according to the technical solution provided by the present invention:

First, the RNC performs step A101: establishing a mapping table of UE RRC state, service QoS, and transport channel type. The RNC performs step A301: according to the current RRC state of the UE and the QoS of the newly created service, the mapping table is checked to obtain the initial allocation type of the transmission channel.

The RNC starts the final allocation of the channel type according to the UE capability and system resource conditions at step A501.

The RNC proceeds at step A503: to determine whether the initial allocation result is a common transmission channel. If yes, go to step A505; otherwise, go to step A509.

The RNC proceeds to step A505: determining whether the public resource is congested, and the congestion decision includes: whether the system resource is currently congested, or whether congestion will occur after accessing the new service. Public resources include: RACH uplink interference, FACH throughput and other resources. If the resources are sufficient, step A507 is performed: returning to the last allocation of a common transport channel, after which the new service uses the common transport channel for service bearer; otherwise, if the common resource is congested, then the process proceeds to step A511, and the HS-DSCH channel allocation is tried.

The RNC is at step A509: determining whether the initial allocation result is an HS-DSCH shared channel. If yes, go to step A511 and try HS-DSCH channel allocation; otherwise, go to step A521 and try DCH channel allocation.

The RNC is at step A511: It is determined whether the UE supports the HS-DSCH. If yes, perform further judgment of the UE capability, and proceed to step A513; otherwise, go to step A521.

The RNC performs the premise judgment of the UE concurrency capability in step A513: whether the UE has an activated service carried by using the DCH. If yes, it indicates that the UE's concurrent capability judgment is required, and the process proceeds to step A515; otherwise, the concurrent capability judgment is not required, and the process proceeds directly to step A517.

The RNC is at step A515: to determine if the UE's concurrent capabilities are sufficient. That is, if the UE simultaneously runs the DCH service and the HS-DSCH service, the rate of the DCH service part exceeds the UE capability upper limit. If the upper limit is not exceeded, the HE capability is sufficient. The new service can use the HS-DSCH bearer and enter step A517. Otherwise, the UE capability is insufficient, and the process proceeds to step A521, and the DCH channel allocation is attempted.

The RNC is in step A517: determining whether the HS-DSCH shared resource is congested, and the congestion decision includes whether the system resource is currently congested or whether congestion will occur after accessing the new service. The HS-DSCH shared resources include: number of users, downlink transmit power, shared channel throughput, and the like. If the resources are sufficient, step A519 is performed: returning the last allocation result one HS-DSCH shared channel, and then the newly established service uses the shared channel for service bearer. Otherwise, if the resource is congested, go to step A521.

The RNC performs the premise judgment of the UE concurrency capability in step A521: whether the UE has an activated service carried by using the HS-DSCH. If yes, it means that the judgment of the UE concurrent capability needs to be performed, and the process proceeds to step A523; otherwise, it does not need to be performed. The judgment of concurrency ability directly enters the A527 step.

The RNC proceeds at step A523 to determine if the UE's concurrent capabilities are sufficient. That is, if the UE simultaneously runs the DCH service and the HS-DSCH service, whether the rate of the DCH service part exceeds the UE capability upper limit. If the UE is fully capable, the new service can use the DCH bearer and directly enter the step A527; otherwise, the UE has insufficient capability and proceeds to step A525.

The RNC is in step A525: unified all the related services using the DCH bearer. These services include: activated services and new services carried using HS-DSCH.

The RNC is in step A527: determining whether the dedicated resource is congested, and the congestion decision includes: whether the system resource is currently congested, or whether congestion will occur after accessing the new service. Dedicated resources include: downlink channelization code, downlink transmit power, uplink interference and other factors. If the resources are sufficient, go to step A529: Return to the last assignment result, a dedicated transmission channel. Otherwise, if the resource is congested, go to step A531: The channel assignment result fails, and the new setup fails.

As can be seen from the foregoing embodiments, the present invention provides channel allocation for providing a common transport channel, an HS-DSCH shared channel, and a dedicated transport channel for a radio bearer according to a UE RRC state, a service QoS characteristic, a UE capability, and a system resource operation situation. method. The method of the invention simultaneously takes into account the current RRC state and capability characteristics of the UE, the characteristics of the service and the transmission channel, and the congestion of various resources of the system, and allocates an optimized transmission channel type for the new call service, and fully ensures the service QoS. Take advantage of system resources.

It is to be understood that the above description of the preferred embodiments of the present invention is intended to be construed as a limitation of the scope of the invention.

Claims

Rights request

a) After the core network initiates the radio access bearer service setup request, the radio network controller initially allocates a common transport channel, a high speed downlink shared channel, or a dedicated channel according to the current radio resource control state of the mobile terminal and the new service quality requirement. ;

b), according to the mobile terminal capability and the resource condition of the system, the final allocation of the transmission channel type, in order to balance the service quality requirement, the mobile terminal capability and the system resource, to allocate an optimal transmission channel for the new call service.

2. The method according to claim 1, wherein the step a) further comprises:

3. The method according to claim 1, wherein the step b) further comprises

Bl) If the initial allocation type is a common transport channel, a common resource congestion decision is performed. If the resource is sufficient, the final allocation result is a common transport channel; if the common resource is congested, the high speed downlink shared channel shared resource allocation decision is performed.

4. The method according to claim 3, wherein the step b) further comprises:

B2) If initially allocated as a high-speed downlink shared channel, perform a mobile terminal capability-related decision to determine whether the mobile terminal supports the high-speed downlink shared channel and whether the mobile terminal service concurrent capability is sufficient; if the mobile terminal has sufficient capability, perform high-speed downlink sharing a shared resource congestion decision for the channel; otherwise, a dedicated transport channel resource allocation decision is made;

B3) a shared resource congestion decision of the idle downlink shared channel, where the shared resource includes the number of users, downlink transmit power, and throughput; if the resource is sufficient, the final allocation result is: a high speed downlink shared channel; if the shared resource is congested, A dedicated transport channel resource allocation decision is made.

The method according to claim 4, wherein the step b) further comprises: -4), if the initial allocation type is a dedicated transport channel, according to the transmission information of the mobile terminal that has activated the service The relevant decision of the mobile terminal capability includes: whether the mobile terminal service concurrency capability is sufficient; if the mobile terminal capability is insufficient, proceeding to step b5); otherwise, directly entering step b6);

B6) performing a dedicated resource congestion decision, where the dedicated resource includes a downlink channelization code, a downlink transmit power, Uplink interference; if the resources are sufficient, the channel allocation is successful, and the final allocation result is: dedicated transmission channel; if the dedicated resource is congested, the transmission channel allocation fails, and the service establishment fails.