WO2009111963A1

WO2009111963A1 - Multi-carrier access method, system and device

Info

Publication number: WO2009111963A1
Application number: PCT/CN2009/070596
Authority: WO
Inventors: 莫君贤; 林佳; 徐宏亮; 刘丽娜
Original assignee: 华为技术有限公司
Priority date: 2008-03-12
Filing date: 2009-03-02
Publication date: 2009-09-17
Also published as: CN101534235A

Abstract

The embodiments of the invention disclose a multi-carrier access method, system and device. The method includes the following steps: the user terminal receives a message from the network-side device, and the message includes recommended carrier information; the user terminal accesses the network based on the recommended carrier information in the message. The embodiments of the invention are in the multi-carrier circumstance, when the user terminal accesses the network for the first time or accesses the network again from the idle mode, the network-side device can make the user terminal access the network through the determined carrier based on the set policy.

Description

The present invention claims to be submitted to the Chinese Patent Office on March 12, 2008, and the application number is 200810007498.9, and the invention name is "a method, system and device for multi-carrier access". Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a method, system, and device for multi-carrier access. Background technique

In the existing communication system, for the purpose of power saving, an idle mode is proposed, and each standard idle mode has a different implementation, but is essentially the same. Now, the IEEE802.16e standard is taken as an example to introduce the idle mode. . In the idle mode, the MS (Mobile Station) can move in a large area and receive downlink broadcast service messages every certain period. The MS does not have to roam the cell to the cell during roaming in this area. BS (BaseStation, base station) is registered. In the idle mode, when the MS roams to different cells, it is not necessary to perform normal operations such as handover, which is beneficial to save MS power and air interface resources. However, the mobile device in idle mode sends a signal to the BS for a location update process when the paging area changes, or when the timer expires.

When the upper layer entity detects that the idle state (Idle Mode) MS has a message, it will initiate the process of paging the MS: PC (Paging Controller) notifies the PA in the entire PG (Paging Group) (Paging Agent, Paging Agent) needs to initiate a paging message, and carries the MS identification information (such as the MS ID, or other information that can identify the MS) that needs to be paged. When the PC is implemented, the PC can be integrated in the base station BS. It can be integrated in the access gateway GW, or integrated in other network entities, or as a separate network entity; the PA can be integrated in the base station when implemented, or integrated into other network entities, or as a separate Network entity; then PA generation band A paging message with a certain MS identity is sent on the air interface. When the MS receives its own matching MS identification information in the paging message, it knows that the PA is paging the MS, and then the MS performs the process of accessing the network.

The paging message sent by the BS is MOB_PAG-ADV, and the message is broadcast by the BS to the MS, and the MS parses the hash value of the MS MAC (Medium Access Control) address in the message with its own The hash value is considered to be that the BS is paging itself, and then the MS performs the corresponding action according to the following Action Code. When the MS enters the idle mode (Idle Mode), it wakes up periodically at the paging listening interval to receive the MOB_PAG_ADV message.

The bandwidth of the multi-carrier system in the prior art can be upgraded and can be expanded. The entire bandwidth is divided into multiple carriers. For example, a 20 MHz bandwidth can be divided into four carriers, each carrier having a bandwidth of 5 MHz. The user terminal can access the network using a certain carrier.

In a multi-carrier system, when a user terminal has the ability to simultaneously demodulate on all carriers of the system, the system can schedule resources on all carriers simultaneously, thus providing a peak rate of 4 艮 high, meeting some peak rate requirements. High business requirements. Terminals that are not capable of simultaneous demodulation on all carriers of the system can also operate in the system, demodulating only a portion of the bandwidth of the system.

In carrying out the process of the present invention, the inventors have found that the prior art has at least the following problems:

In the case of multi-carrier, the user terminal may randomly select one carrier to access, or pre-arrange a carrier to access the network side, etc., when the user terminal selects that the loaded carrier is overloaded or the signal is not good, it will affect the The user terminal accesses the network, for example, the access may fail. On the other hand, the base station cannot notify the user terminal of the carrier load condition, so that the user terminal cannot select the carrier access according to the information, which may cause the load to be unbalanced for a long time between the carriers. Summary of the invention

Embodiments of the present invention provide a method, system, and device for multi-carrier access to control On which carrier the mobile station is connected to the network.

The embodiment of the present invention provides a method for multi-carrier access, including the following steps: The user terminal receives a message sent by a network side device, where the message carries recommended carrier information;

Accessing the network according to the recommended carrier information in the message.

An embodiment of the present invention provides a multi-carrier access system, including the following steps: The network side device is configured to select one or more recommended access carriers according to a carrier load condition or a carrier channel condition, and the one or more Sending information of multiple recommended access carriers to the user terminal;

The user terminal is configured to receive a message sent by the network side device, where the message carries the recommended carrier information, and accesses the network according to the recommended carrier information.

An embodiment of the present invention provides a user terminal, including:

a receiving unit, configured to receive a message sent by the network side device, where the message carries the recommended carrier information;

An access unit, configured to access the network according to the recommended carrier information.

The embodiment of the invention provides a network side device, including:

a policy unit, configured to select one or more carriers as the recommended access carrier according to a preset policy;

And a sending unit, configured to send information about the one or more recommended access carriers to the user terminal.

In the embodiment of the present invention, in the case of a multi-carrier, the network-side device may control the user terminal to perform on the set carrier when the user terminal accesses the network according to the setting policy, including the case of initial network access or re-entering from the idle mode. Network access. DRAWINGS

1 is a flowchart of a method for multi-carrier access in an embodiment of the present invention; FIG. 2 is a flowchart of an MS in which an AP paging is in an idle mode according to an embodiment of the present invention; FIG. 3 is an idle mode according to an embodiment of the present invention; The terminal MS actively sends a network access request message to exit the idle mode flowchart; 4 is a flowchart of an initial network access operation performed by an MS actively issuing a network access request message according to an embodiment of the present invention;

FIG. 5 is a structural diagram of a system for multi-carrier access in an embodiment of the present invention. detailed description

In the case of the multi-carrier, the network-side device (such as the base station BS) can carry the recommended access carrier information in the paging message when the user equipment (such as the MS) is paging, so that the MS receives the information. After the message is invoked, the network may be re-entered according to the carrier recommended by the network side device; or when the terminal MS initiates an access request codeword (RNG-Code) or an access request message (RNG-REQ Message), the base station BS may be in the response message. The recommended access carrier information is carried, so that after receiving the response message, the MS can perform network access according to the carrier recommended by the network side device. Therefore, in the embodiment of the present invention, when the load of each carrier of the BS is unbalanced, the MS accesses the carrier with a relatively light load, thereby achieving the purpose of load balancing of each carrier, and also realizing that the BS can control the MS being paged. Which carrier enters the access function.

In the case of the multi-carrier, when the terminal MS is accessing the network (including the initial network access and the re-entry network), the BS can notify the terminal MS of the recommended carrier information through the message, and the terminal performs the network access procedure according to the recommended carrier information.

The terminal re-enters the network: The terminal MS has accessed the network, and then enters the idle state (Idle Mode). When the terminal MS in the idle state (Idle Mode) exits the idle state, the network access operation is performed, which is called re-entering. There are two scenarios in which the terminal exits the idle state. One is that the network side actively sends a paging message to trigger the MS to exit the idle state. The other is that the terminal MS actively sends a network access request message to exit the idle mode, and the access request message may be The ranging code (RNG-Code) or the ranging message (RNG-REQ), etc., of course, is not limited to this. In both cases, the BS can select one according to its own strategy, such as the load condition of each carrier. The plurality of recommended access carriers are sent to the terminal MS in various message formats, so that the MS can access the network according to the access carrier information, and the carrier information may include a carrier index or a center frequency point. (center frequency) or bandwidth (bandwidth) and other information.

The initial network access situation of the terminal: This is the first network access operation that the terminal has not successfully accessed the network before. The terminal MS actively sends a network access request message, and the access request message may be a ranging code (RNG-Code). Or, the ranging message (RNG-REQ), etc., of course, the implementation time is not limited to this. The BS can select one or more recommended access carriers according to its own strategy, such as the load condition of each carrier, and send it to various messages. The terminal MS enables the MS to access the network according to the access carrier information, and the carrier information may include information such as a carrier index or a center frequency or a bandwidth.

The embodiment of the present invention is only an idle mode and paging of IEEE 802.16e as an example, and does not mean that the present invention is only applicable to IEEE 802.16e, just because the idle mode and the paging principle of all systems are similar, so as an example description This patent is suitable for all multi-carrier systems, such as IEEE 802.16m.

The embodiment of the present invention provides a method for multi-carrier access, as shown in FIG. 1 , including the following steps:

Step 101: The user terminal (MS) receives a message sent by the network side device (BS), where the message carries recommended carrier information. The message may be a paging message or an access response message, etc., and the access response message may be a ranging response message RNG-RSP when implemented.

Step 102: The user terminal (MS) performs a synchronization access operation procedure according to the recommended carrier information in the message. The recommended carrier information includes: a carrier index, a carrier center frequency, and a carrier bandwidth.

In the second embodiment of the present invention, the MS that is in the idle mode of the BS is configured to carry the recommended carrier information in the paging message, and after receiving the paging message, the MS exits the idle mode according to the message indication, and according to the recommended carrier in the paging message. Information is put into the network. The specific process is shown in Figure 2, including the following steps:

Step 201: The BS sends a paging message to the MS to trigger the MS to exit the idle state. The BS may select one or more recommended access carriers according to the policy of the carrier, such as the load condition or channel condition of each carrier, and carry the message in the paging message. The carrier information is sent to the terminal MS. The carrier information may include a carrier index (carrier index) and a center frequency point. ( center frequency ) or bandwidth ( bandwidth ) and other information. The recommended carrier (Recommended Carrier) can also be called the recommended access carrier.

Step 202: The MS receives the paging message, exits the idle mode according to the indication, and accesses the network according to the recommended carrier information in the message. In the third embodiment of the present invention, the terminal MS in the idle mode actively sends a network access request message to exit the idle mode, and the access request message may be a ranging code (RNG-Code) or a ranging message (RNG-REQ). Of course, the implementation is not limited to this. The BS selects one or more recommended access carriers according to its own policy, such as the load condition of each carrier or the channel condition of each carrier, and sends the response to the terminal MS in the access response message. The message may be a ranging response message RNG-RSP, so that the MS can access the network according to the carrier information. The specific process is shown in Figure 3, including the following steps:

Step 301: The terminal MS in the idle mode actively sends a network access request message to exit the idle mode, and the access request message may be a ranging code (RNG-Code), or a ranging message (RNG-REQ), etc., of course, when implemented. Not limited to this. Optionally, the MS may carry the carrier information that is to be accessed in the access request message. This step is an optional step.

Step 302: The BS selects one or more recommended access carriers according to the policy of the carrier, such as the load condition of each carrier, or the channel condition of each carrier, and sends the response to the terminal MS. The access response message may be RNG-RSP message. The BS may send an RNG-RSP message after receiving the access request message, or may actively send an RNG-RSP message.

Step 303: The MS performs a network access operation on the recommended carrier.

The network access operation includes: downlink channel scanning, establishing synchronization with the BS; obtaining uplink transmission parameters; performing ranging (ranging); negotiating basic capabilities (optional); performing key exchange (optional); performing registration; establishing an IP connection Wait for steps (optional).

In the fourth embodiment of the present invention, the terminal MS actively sends a network access request message to perform the initial network access operation, and the access request message may be a ranging code (RNG-Code) or a ranging message (RNG-REQ), etc., of course, when implemented. Not limited to this, BS is based on its own strategy, The one or more recommended access carriers are selected and sent to the terminal MS in the access response message, such as the load condition of each carrier or the channel condition of each carrier, and the access response message may be an RNG-RSP message, so that the MS can be based on This carrier information is used to access the network. The specific process is shown in Figure 4, including the following steps:

Step 401: The terminal MS actively sends a network access request message to perform the initial network access operation, and the access request message may be a ranging code (RNG-Code), or a ranging message (RNG-REQ), etc., of course, the implementation time is not limited thereto. Optionally, the MS may carry the carrier information that it wants to access in the access request message. This step is optional.

Step 402: The BS selects one or more recommended access carriers according to the policy of the carrier, such as the load condition of each carrier or the channel condition of each carrier, and sends the response to the terminal MS in the access response message. The access response message may be an RNG. -RSP message. The BS may send an RNG-RSP message after receiving the access request message, or may actively send an RNG-RSP message.

Step 403: The MS performs a network access operation on the recommended carrier. The network access operation includes: downlink channel scanning, establishing synchronization with the BS; obtaining uplink transmission parameters; performing ranging (ranging); negotiating basic capabilities (optional); performing key exchange (optional); performing registration; establishing IP Connect (optional) and other steps.

The synchronization operation is required before the network access, including: carrier synchronization: carrier synchronization of the originating end and the receiving end, including the frequency and phase of the carrier; symbol synchronization: the receiving end determines the start and end time of each OFDM symbol, that is, determines an accurate FFT window position; Frame synchronization: Correlate with the pilot, obtain the correlation peak, get the start of the frame, and achieve frame synchronization. The synchronization operation optionally includes sample synchronization for determining the optimal sampling position of the sample, including sample timing synchronization and sample frequency synchronization, and the sample timing synchronization is for the receiving end to determine the sampling of each sample. Position; Sample frequency synchronization is to ensure that the sampling frequency of the receiving end is synchronized with the transmitting end.

An embodiment of the present invention provides a multi-carrier access system, as shown in FIG. 5, including: a network side device 200, configured to select one or more recommended access carriers according to a carrier load condition or a carrier channel condition, and Information of one or more recommended access carriers is transmitted to the user terminal 100. The user terminal 100 is configured to receive the cancellation sent by the network side device 200. The message carries the recommended carrier information and accesses the network according to the recommended carrier information. The recommended carrier information includes: a carrier index, a carrier center frequency, and a carrier bandwidth.

The network side device 200 specifically includes: a selecting unit 210, configured to select one or more carriers as recommended access carriers according to a preset policy, and a sending unit 220, configured to send information of one or more recommended access carriers The user terminal 100 is configured to: after receiving the access request message, trigger the selection unit 210, or actively trigger the selection unit 210.

The user terminal 100 specifically includes: a receiving unit 110, configured to receive a message sent by the network side device, where the message carries recommended carrier information; and the access unit 120 is configured to access the network according to the recommended carrier information.

In the embodiment of the present invention, in the case of a multi-carrier, the network-side device may, when the user terminal first enters the network or re-enters the network from the idle mode, according to a setting policy, such as a load condition of each carrier, or a channel condition of each carrier. Controlling which carrier the user terminal is connected to, for example, the network side device can control the user terminal to access the network on a carrier with a light load, thereby achieving load balancing.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or can be implemented by means of software plus necessary general hardware platform, and the technical solution of the present invention. It can be embodied in the form of a software product that can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for making a computer device (may It is a personal computer, a server, or a network device, etc.) that performs the methods described in various embodiments of the present invention.

In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Rights request

A method for multi-carrier access, comprising the steps of: receiving, by a user equipment, a message sent by a network side device, where the message carries recommended carrier information;

2. The method of multi-carrier access according to claim 1, wherein the message is a paging message or a ranging response message.

The method for multi-carrier access according to claim 1, wherein the user terminal further includes the user terminal transmitting an access request message to the network side device before receiving the message sent by the network side device.

The method of multi-carrier access according to claim 3, wherein the access request message is a ranging code RNG-Code or a ranging message RNG-REQ.

The method of multi-carrier access according to claim 3, wherein the access request message carries carrier information that the user terminal wishes to access.

The method for multi-carrier access according to any one of claims 1 to 5, wherein before the user terminal receives the message sent by the network side device, the method further includes:

The network side device selects one or more recommended access carriers according to a carrier load condition or a carrier channel condition;

Sending information of the one or more recommended access carriers to the user terminal.

The method of multi-carrier access according to any one of claims 1 to 5, wherein the recommended carrier information comprises: a carrier index, a carrier center frequency, and a carrier bandwidth.

A multi-carrier access system, comprising: the following steps: a network side device, configured to select one or more recommended access carriers according to a carrier load condition or a carrier channel condition, and select the one or Sending information of multiple recommended access carriers to the user terminal;

a user terminal, configured to receive a message sent by the network side device, where the message carries a push The carrier information is recommended, and the network is accessed according to the recommended carrier information.

The multi-carrier access system of claim 8, wherein the recommended carrier information comprises: a carrier index, a carrier center frequency, and a carrier bandwidth.

10. A user terminal, comprising:

a receiving unit, configured to receive a message sent by the network side device, where the message carries a push: carrier information;

A network side device, comprising:

The network side device according to claim 11, further comprising: a triggering unit, configured to receive an access request message sent by the user terminal, trigger the policy unit, or actively trigger the policy unit.