WO2008009231A1

WO2008009231A1 - A method and device for beam-forming fach

Info

Publication number: WO2008009231A1
Application number: PCT/CN2007/070267
Authority: WO
Inventors: Song Wu; Yong Fan; Na Luo; Xian Liu; Xiaopeng Tong
Original assignee: Datang Mobile Communications Equipment Co., Ltd
Priority date: 2006-07-12
Filing date: 2007-07-11
Publication date: 2008-01-24
Also published as: CN101106409A; CN101106409B

Abstract

A method includes: making a Random Access Channel RACH to correspond to a Forward Access Channel FACH, using the beam-forming informing obtained by measuring the RACH to beam-form the FACH data and sending it. The device is disclosed thereof. It overcomes the technical shortcoming that could not beam-form the FACH data so as not to use excellences of intelligent antennae enough. A BS measures RACH when it receives the random access request through RACH from a user equipment UE, and it sends the beam-forming information and the RACH data to a RNC together. The RNC sends the beam-forming information and FACH data to the BS together. The BS uses the beam-forming information to beam-form the FACH data sent to the UE. It uses the excellences of intelligent antennae enough by performing the invention, obtains the bigger beam-forming gain and restrains the disturbing synchronously so as to improve the efficiency of the whole system.

Description

Method and apparatus for shaping a forward access channel FACH

Technical field

The present invention relates to a method for shaping a FACH, and in particular, to a random access channel (RACH) corresponding to a forward access channel (FACH), which is obtained by measuring a RACH. Method and apparatus for shaping and transmitting FACH data. Background technique

In the TD-SCDMA system, both the random access channel RACH and the forward access channel FACH are common channels and are commonly used by all users in the cell. The RACH is mainly used for the user equipment (UE) to send the uplink random access request information, the FACH is used to respond to the random access request of the UE, and the network side uses the FACH to send some signaling or data information for a certain UE, such as RRC. A link setup message, a Radio Bearer (RB) setup message or service data is sent to the UE.

When a user needs to establish a service link, it first needs to synchronize with the network side through a random access procedure and send a random access request to the network. The random access request information is transmitted through the RACH of the random access channel, that is, the terminal sends its own random access request information to the base station through the RACH, and the base station performs decoding processing and sends the information to the radio network controller RNC. When the base station receives the random access request sent by the UE through the RACH, the uplink RACH may be measured to obtain information about the uplink shaping information sent by the UE, such as an ANGLE OF ARRIVAL (AAA), when the base station gives the information. When the UE sends the downlink data, the uplink shaping information can be used to shape the channel carrying the downlink data, such as FACH. However, due to the incompleteness of the protocol, in the current system, when the base station receives data through the RACH and transmits data through the FACH, the base station cannot know the correspondence between the RACH and the FACH carrying a certain UE information, and therefore cannot use the uplink receiving RACH. In the current implementation, for the FACH, all the directional transmissions are performed, and the FACH of each access UE cannot be shaped.

The omnidirectional transmission of FACH not only does not fully utilize the advantages of smart antennas, but also The system generates large interference, resulting in insufficient coverage, low network access success rate, system capacity reduction, and poor network service quality. Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for shaping a forward access channel FACH to address various technical deficiencies associated with omnidirectional transmission of FACH. The present invention proposes the following technical solutions:

A method for shaping a forward access channel FACH includes the following steps:

Step A: The base station measures the random access channel RACH to obtain an uplink shaping parameter and converts it into a shaping feature field;

Step B: The base station reports the shaped feature field and the RACH data to the radio network controller

RNC;

Step C: The RNC sends the shaping feature field and the FACH data to the base station. Step D: The base station converts the shaping feature field into a downlink shaping vector, and then sends and sends the FACH data.

The method for shaping a FACH, where the step A includes a step of measuring, by the base station, the uplink pilot channel UpPTS, and the base station combines the result data of the measurement of the UpPTS with the result data of the measurement of the RACH. The ascending shaping parameter is generated.

The foregoing method for forming a FACH, where the step B specifically includes: Step B11: Combining the shaping feature field and the RACH data into a reporting interface protocol data frame;

Step B12: Send the combined report interface protocol data frame to the RNC.

The above method for forming a FACH, wherein the base station uses the lub interface when reporting the RACH data to the RNC, and stores the shaped feature field in an extension field of the reporting interface protocol data frame.

The method for shaping a FACH, where the step C specifically includes: Step C11: extracting the shaping feature field from the reporting interface protocol data frame; Step C12, the shaping feature field Combining with the FACH data to form a sending interface protocol data frame; Step C13: Send the combined outgoing interface protocol data frame to the base station.

The foregoing method for forming a FACH, wherein the RNC uses the lub interface when delivering the FACH data to the base station, and stores the shaped feature field in an extension field of the downlink interface protocol data frame.

The method for shaping a FACH, where the base station uses the same downlink shaping vector pair FACH data when the FACH data frame requiring multiple transmission time intervals can be used to transmit all FACH data in the step D. Perform a shaped transmission.

The foregoing method for forming a FACH, where the step D specifically includes: Step D11: converting the shaped feature field into the uplink shaping parameter;

Step D12: Perform shaping processing on the uplink shaping parameter to obtain a downlink shaping vector. Step D13: Perform shaping and transmission of the FACH data by using the downlink shaping vector.

The foregoing method for forming a FACH, where the step A includes: Step All: The base station measures the random access channel RACH to obtain an uplink shaping parameter; Step A12: Obtain the local shaping information table of the base station An index number corresponding to the uplink shaping parameter;

Step A13: The base station converts the index number into the shaping feature field.

The step D specifically includes:

Step D21: The base station converts the shaping feature field into the index number.

Step D22: The base station acquires the uplink shaping parameter in a local shaping information table according to the index number.

Step D23: The base station obtains the uplink shaping parameter and performs shaping processing to obtain a downlink shaping vector.

Step D24: Perform shaping and transmission of the FACH data by using the downlink shaping vector.

The method for shaping the FACH, wherein the step A specifically includes: Step A21: The base station measures the random access channel RACH to obtain an uplink shaping parameter; Step A22: shaping the uplink shaping parameter After processing, a downlink shaping vector is obtained; Step A23, converting the downlink shaping vector into a shaping feature field.

The method for shaping the FACH, wherein the step A23 specifically includes: Step A231: The base station acquires the corresponding information of the downlink shaping vector in the local shaping information table. Quotation mark

Step A232: The base station converts the index number into the shaping feature field.

The step D specifically includes:

Step D31: The base station converts the shaping feature field into the index number.

Step D32: Obtain a corresponding downlink shaping vector in the local shaping information table according to the index number base station;

Step D33: The base station uses the downlink shaping vector to form and send the FACH data.

A device for shaping a forward access channel FACH, comprising:

a shaping feature field obtaining module, configured to measure the random access channel RACH to obtain an uplink shaping parameter, and convert the same into a shaping feature field;

a first sending module, configured to report the shaped feature field and the RACH data to the radio network controller RNC;

And a second sending module, configured to send the shaped feature field and the FACH data to the base station; and the shaping module is configured to perform the shaping and sending of the FACH data after converting the shaped feature field into a downlink shaping vector.

The device for shaping a FACH, wherein the shaping feature field obtaining module, the first sending module, and the shaping module are disposed in a base station; and the second sending module is disposed in a wireless network controller.

The above apparatus for shaping a FACH, wherein the shaping feature field and the RACH data are combined into a reporting interface protocol data frame transmission.

The device for shaping a FACH, wherein the shaping feature field is stored in an extension field of the reporting interface protocol data frame.

The device for shaping a FACH, wherein the shaping feature field is combined with the FACH data to send a delivery interface protocol data frame.

The device for shaping a FACH, wherein the shaping feature field is stored in an extension field of the data interface of the sending interface protocol.

The device for shaping a FACH, wherein the shaping module specifically includes: a shaping feature field converting unit, configured to convert the shaping feature field into the uplink shaping parameter; a downlink shaping vector obtaining unit, configured to perform a shaping process on the uplink shaping parameter to obtain a downlink shaping vector;

And a shaping transmitting unit, configured to perform shaping and transmitting of the FACH data by using the downlink shaping vector. The device for shaping the FACH, wherein the shaping feature field obtaining module includes:

The first uplink shaping parameter obtaining unit is configured to measure the random access channel RACH to obtain an uplink shaping parameter;

An index number obtaining unit, configured to obtain, in the shape information table, an index number corresponding to the uplink shaping parameter;

An index number conversion unit, configured to convert the index number into the shaped feature field; the shaping module specifically includes:

a shaping feature field conversion unit, configured to convert the shaped feature field into the index number; and a second uplink shape parameter obtaining unit, configured to acquire, according to the index number, the local shape information table Upward shaping parameters;

a downlink shaping vector acquiring unit, configured to obtain a downlink shaping vector after obtaining the uplink shaping parameter and performing shaping processing;

And a shaping transmitting unit, configured to perform shaping and transmitting of the FACH data by using the downlink shaping vector. The device for shaping the FACH, wherein the shaping feature field obtaining module specifically includes:

The uplink shaping parameter obtaining unit is configured to measure the random access channel RACH to obtain an uplink shaping parameter;

a first downlink shaping vector acquiring unit, configured to perform shaping processing on the uplink shaping parameter to obtain a unit of a downlink shaping vector;

An index number obtaining unit, configured to obtain an index number corresponding to the downlink shaping vector in a local shape information table;

a shaping feature field converting unit, configured to convert the shaped feature field into the index number; a second downlink shaping vector obtaining unit, configured to locally shape the information table according to the index number Obtaining the downlink shaping vector;

And a shaping transmitting unit, configured to perform shaping and transmitting of the FACH data by using the downlink shaping vector. By using the method and device disclosed by the present invention, the uplink shaping information is applied to the shaping and transmitting of the downlink FACH data, and the advantages of the smart antenna are fully utilized, and a large shaping gain can be obtained while suppressing interference. Improve the efficiency of the entire system. DRAWINGS

1 is a flowchart of processing disclosed in the present invention;

2 is a data frame format used by a base station to report RACH data according to the present disclosure; FIG. 3 is a data frame format used when a RNC sends FACH data according to the present invention; FIG. 4 is a schematic structural diagram of an apparatus according to the present invention. detailed description

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the method of the present invention can be divided into four large steps as a whole;

Step 1: When detecting, by the base station, a random access request sent by the UE through the random access channel (RACH), the base station measures the RACH to obtain an uplink shaping parameter, and then converts the uplink shaping parameter into a shaping feature field;

Smart antennas can be shaped using a variety of algorithms, such as eigenvalue EBB shaping algorithms, raster scanning based GOB shaping algorithms, and so on.

For the EBB shaping algorithm, the measured upforming parameters are feature vectors that characterize the channel direction characteristics.

For the GOB shaping algorithm, the signal direction angle feature (e.g., obtaining AO A ) can be measured by scanning the uplink signal, and the direction angle can be an absolute angle or a relative angle of the antenna array.

Taking the TD-SCDMA system as an example, the basic random access procedure is as follows: The UE first sends a SYNCJJL code on the uplink pilot channel UpPTS, and the base station detects the SYNCJJL code sent by the UE, and then sends the physical layer to the UE through the fast physical access channel FPACH. The response information on the FPACH mainly includes the transmission power of the desired physical random access channel PRACH and the location of the SYNCJJL code sent by the base station, and the UE receives the backhaul sent by the base station from the FPACH channel. After the information is received, the access request information is sent through the RACH channel. Therefore, when the base station measures the shaping information, the RACH may be separately measured to obtain an uplink shaping parameter, and the measurement information of the UpPTS channel and the measurement information of the RACH may be combined to generate an uplink shaping parameter.

The shaping feature field is converted from the uplink shaping parameter measured by the base station, and the conversion manner may be the following:

The first is to directly convert the uplink shaping parameters into the shaping feature fields: In this way, when the base station performs the shaping and transmitting of the FACH, the base station first takes the uplink shaping parameters from the shaping feature field, and then passes the shaping. After processing, the downlink shaping vector can be obtained.

The shaping process refers to the process of obtaining the downward shaping vector corresponding to the shaping algorithm according to the corresponding shaping algorithm.

The second method is that the base station first performs shaping processing on the obtained uplink shaping parameters to obtain a downlink shaping vector, and then converts the downlink shaping vector into a shaping characteristic field.

The third is to first map the uplink shaping parameters or the shaped shaping vector to an index number, and then organize the index numbers into the shaping feature fields. The base station locally establishes an shaping information table according to different uplink shaping parameters or downlink shaping vectors, and the shaping information table includes the correspondence relationship between the index number and the uplink shaping parameter or the downlink shaping vector, and the base station performs the mapping operation. The measured uplink shaping parameter or the downlink shaping vector is mapped to an index number. The main purpose of establishing the shape information table and mapping is to reduce the number of bytes transmitted between the Iub interfaces, which increases the transmission bandwidth while increasing the operation of the base station.

Step 2: When the base station reports the RACH data sent by the UE to the RNC, the base station reports the feature field to the RNC.

The base station decodes the RACH data sent by the UE, and combines the measured shape information with the decoded data to form a report interface protocol data frame (Iub RACH data frame, as shown in FIG. 2) and then reports it to the RNC.

Step 3: When the FACH data is sent to the base station, the RNC sends the shaped feature field to the base station together;

After receiving the RACH data, the RNC sends the relevant signaling or data to the UE through the base station using the FACH channel after the user is allowed to access. The FACH data is first sent to the base station through the Iub interface, and the base station performs downlink coding, mapping, and modulation scrambling, and then sends the signal to the UE. RNC When the FACH data is sent to the base station, the shaped feature field reported by the base station is extracted from the received reporting interface protocol data frame, and the FACH data is combined with the FACH data to be the outgoing interface protocol data frame (Iub FACH data frame). , as shown in Figure 3, are sent together to the base station.

Step 4: The base station transforms the shaped feature field into a downlink shaping vector, and then sends and sends the FACH data.

After receiving the FACH data frame, the base station extracts the data and the corresponding shaped feature field, converts the shaped feature field into a downlink shaping vector, and performs coding mapping and modulation scrambling on the FACH data information, and then uses the downlink assignment. The shape vector is shaped and sent.

The conversion step of the shape feature field to the downlink shape vector has several ways depending on the situation: If the shape feature field is directly converted from the down shape vector, the downlink shape vector is directly obtained from the shape feature field.

If the shaped feature field is converted by the uplink shaping parameter, it needs to be converted into an uplink shaping parameter, and then subjected to the shaping process to obtain a corresponding downlink shaping vector;

If the shaped feature field is converted by the index number, the corresponding uplink shaping parameter or the downlink shaping vector is obtained according to the index number in the local shaping information table of the base station; if the shaping information table stores For the uplink shaping parameters, the shaping process is also required to obtain the corresponding downlink shaping vector.

When the random access is performed for the same RACH data of the same UE, when the downlink required multiple FACH data frames of the transmission time interval (ΤΉ) can transmit the relevant signaling or data, the FACH data of these TTIs use the same The downlink shaping vector performs shaping transmission.

In order to facilitate the transmission of the shaped information between the RNC and the base station, and compatible with the existing protocol version and implementation, the present invention transmits the RACH data reporting frame protocol data frame structure of the existing base station to the RNC and the FACH sent by the RNC to the base station. The data frame structure of the outgoing interface protocol of the data is modified. The specific modification manner is shown in FIG. 2 and FIG. 3, that is, the information related to the shaping is placed on the extension field of the Iub RACH data frame and the Iub FACH data frame. If the shaped information is AOA related information, there are a total of 16 bits, occupying two bytes of the extended field.

In Figures 2 and 3, a data frame is typically composed of a plurality of transport blocks, each of which is composed of a plurality of bytes. In the drawings, it is shown that the omitted drawing method is convenient. The ellipsis between the first transport block in the figure represents several bytes in the middle of the first transport block. The first transport block and the last pass The ellipsis between the blocks represents several transport blocks in the middle. When the shape information is composed of a plurality of bytes, its manner in the data frame is as shown in FIG. 2 and FIG. 3, and the ellipsis in the shape information represents a plurality of bytes in the middle. The overall frame structure of the RACH data frame and the FACH data frame is well known and determined, and is clearly defined in the current 3GPP specifications, and can refer to 3GPP TS 25.435.

The device for shaping the forward access channel FACH of the present invention, as shown in FIG. 4, includes: a shaping feature field obtaining module 41, configured to measure an uplink access channel RACH to obtain an uplink shaping parameter, and It is converted into a shaped feature field;

The first sending module 42 is configured to report the shaped feature field and the RACH data to the wireless network controller RNC;

The second sending module 43 is configured to send the shaping feature field and the FACH data to the base station, and the shaping module 44 is configured to transform the FACH data by converting the shaping feature field into a downlink shaping vector. send.

The shaping feature field obtaining module, the first sending module, and the shaping module are disposed at the base station; and the second sending module is disposed in the wireless network controller.

The shape feature field is converted from the uplink shape parameter measured by the base station, and the conversion manner may be the following:

The third is to first map the uplink shaping parameter or the shaped shaping vector to an index number, and then organize the index number into a shaping feature field. The base station locally establishes an shaping information table according to different uplink shaping parameters or downlink shaping vectors, and the shaping information table includes the correspondence relationship between the index number and the uplink shaping parameter or the downlink shaping vector, and the base station performs the mapping operation. The measured uplink shaping parameter or the downlink shaping vector is mapped to an index number. The main purpose of establishing the shape information table and mapping is to reduce the number of bytes transmitted between Iub interfaces, which increases the operation of the base station. Can save transmission bandwidth.

For the corresponding shaping module, there are several ways to convert the shaping feature field to the downlink shaping vector according to the situation:

If the shaped feature field is directly converted from the downward shaped vector, the downward shaped vector is obtained directly from the shaped feature field.

The shaping feature field and the RACH data are combined into a reporting interface protocol data frame transmission, and the shaping feature field is stored in an extension field of the reporting interface protocol data frame.

And the shaping feature field is combined with the FACH data to be sent to the sending interface protocol data frame, and the shaping feature field is stored in the extended field of the sending interface protocol data frame.

The invention may be embodied in a variety of other embodiments without departing from the spirit and scope of the invention.

Claims

Claim

A method for forming a forward access channel FACH, comprising the steps of:

Step B, the base station reports the shaped feature field and the RACH data to the radio network controller RNC;

Step C: The RNC sends the shaping feature field and the FACH data to the base station;

Step D: The base station transforms the FACH data into a downlink shaping vector and then sends the FACH data.

The method for shaping a FACH according to claim 1, wherein the step A further includes a step of the base station measuring the uplink pilot channel UpPTS, and the base station compares the result data of the UpPTS measurement with The result data of the measurement of the RACH is combined to generate the ascending shaping parameter.

The method of forming a FACH according to claim 1, wherein the step B specifically includes:

Step B11: Combining the shaping feature field and the RACH data into a reporting interface protocol data frame;

Step B12: Send the combined report interface protocol data frame to the RNC.

The method for shaping a FACH according to claim 3, wherein the base station uses the lub interface to report the RACH data to the RNC, and stores the shaping feature in an extension field of the reporting interface protocol data frame. Field.

The method of forming a FACH according to claim 3, wherein the step C specifically includes:

Step C11: Extract the shaped feature field from the reporting interface protocol data frame; Step C12, combine the shaped feature field and the FACH data into a sending interface protocol data frame;

Step C13: Send the combined outgoing interface protocol data frame to the base station.

The method for forming a FACH according to claim 5, wherein the RNC uses the lub interface to deliver the FACH data to the base station, and stores the assignment in the extension field of the data interface of the outgoing interface protocol. Shape feature field.

The method for shaping a FACH according to claim 1, wherein in the step D, when the FACH data frame requiring multiple transmission time intervals in the downlink can transmit all the FACH data, the base station uses The same downlink shaping vector is used to shape and transmit the FACH data.

The method for forming a FACH according to any one of claims 1 to 7, wherein the step D specifically includes:

Step D11: Convert the shaped feature field to the uplink shaping parameter.

The method of forming a FACH according to any one of claims 1 to 7, wherein the step A specifically includes:

Step All, the base station measures the random access channel RACH to obtain an uplink shaping parameter; Step A12: Obtain an index number corresponding to the uplink shaping parameter in a shape information table local to the base station;

The step D specifically includes:

The method for forming a FACH according to any one of claims 1 to 7, wherein the step A specifically includes:

Step A21: The base station measures the random access channel RACH to obtain an uplink shaping parameter. Step A22: performing shaping processing on the uplink shaping parameter to obtain a downlink shaping vector. Step A23: converting the downlink shaping vector Form a feature field.

The method of forming a FACH according to claim 10, wherein the step A23 specifically includes:

Step A231: The base station acquires an index number corresponding to the downlink shaping vector in a local shape information table.

The step D specifically includes:

An apparatus for shaping a forward access channel (FACH), comprising: a shaped feature field obtaining module, configured to measure a random access channel RACH to obtain an uplink shaping parameter, and convert the same For shaping feature fields;

The apparatus for shaping a FACH according to claim 12, wherein the shaping feature field obtaining module, the first transmitting module, and the shaping module are disposed at a base station; Wireless network controller.

14. The apparatus for shaping a FACH according to claim 12, wherein the shaped feature field and the RACH data are combined into a reporting interface protocol data frame transmission.

15. The apparatus for shaping a FACH according to claim 14, wherein the shaped feature field is stored in an extension field of the reporting interface protocol data frame.

16. The apparatus for shaping a FACH according to claim 12, wherein the shaped feature field and the FACH data are combined into a sending interface protocol data frame transmission.

17. The apparatus for shaping a FACH according to claim 16, wherein the shaping feature field is stored in an extension field of the outgoing interface protocol data frame.

The device for shaping a FACH according to any one of claims 12 to 17, wherein the shaping module specifically comprises:

a shaped feature field converting unit, configured to convert the shaped feature field into the uplink forming parameter;

a downlink shaping vector obtaining unit, configured to perform a shaping process on the uplink shaping parameter to obtain a downlink shaping vector;

And a shaping transmitting unit, configured to perform shaping and transmitting of the FACH data by using the downlink shaping vector.

The device for shaping a FACH according to any one of claims 12 to 17, wherein the shaping feature field obtaining module specifically comprises:

The device for forming a FACH according to any one of claims 12 to 17, wherein the shaping feature field obtaining module specifically comprises:

An index number obtaining unit, configured to obtain an index number corresponding to the downlink shaping vector in a local shape information table; An index number conversion unit, configured to convert the index number into the shaped feature field; the shaping module specifically includes:

a shaping feature field converting unit, configured to convert the shaping feature field into the index number; and a second downlink shaping vector acquiring unit, configured to acquire, according to the index number, the local shaping information table Downward shaping vector;