CN104579547A - Data transmission method - Google Patents

Abstract

A data transmission method, the method comprising: when an online user transmits uplink data, assigning a fixed resource authorization to the uplink data including the group A preamble, and assigning a resource authorization to the uplink data including the group B preamble according to existing resources ; The message sent by the terminal to the base station on the resource authorization carries the cell wireless network temporary identifier C-RNTI and uplink data; the base station determines that the reason for the online user to enter the online state according to the C-RNTI is that there is no data transmission, and the received message carries uplink data. After applying the embodiment of the present invention, the data transmission can be realized quickly by using the message to transmit data, and the frequent online reactivation process of interactive services with small data volumes can be avoided, resulting in ping-pong allocation of PUCCH resources.

Description

A method of data transmission

technical field

The present application relates to the technical field of communications, and more specifically, to a data transmission method.

Background technique

During data transmission, if the terminal is in the uplink synchronization state, the network considers the user to be in the active state and belong to the active user. Activated users can use physical uplink control channel (PUCCH) resources to apply for uplink scheduling resources at any time for data transmission. If the terminal is in the uplink out-of-sync state, the network considers that the user is in the online state and belongs to the connected online user. An online user is defined as an out-of-link uplink with an RRC connection and no PUCCH/uplink listening reference signal SRS resources.

The main scenarios for converting a currently active user to an online user include situations where the TA timer expires or the SR reaches the maximum number of transmissions. When the currently activated user is converted into an online user, the terminal will notify the upper layer to release the PUCCH and SRS resources, that is, the activated user will be converted into an online user.

Online users cannot directly transmit data because they do not have uplink synchronization and PUCCH resources. When there is uplink data transmission, the following four processes are required:

1) Uplink synchronization process;

2) PUCCH resource allocation and air interface configuration process at the base station side;

3) Uplink resource scheduling request and uplink resource authorization;

4) Uplink data transmission;

Take the uplink data transmission of online users as an example:

When there is uplink data transmission, the terminal side judges that the uplink is out of synchronization, and completes the uplink synchronization through the random access process; The network temporary identifier (C-RNTI) queries online users, and then re-allocates PUCCH resources for the queried users, notifies the users of the allocated PUCCH resources through the air interface reconfiguration message, and notifies all layers of the base station side.

For interactive services with a small amount of data, such as QQ chat, etc., if data transmission is realized through random access and allocation of PUCCH, the online reactivation process will be frequently triggered, resulting in ping-pong PUCCH resource allocation. Due to too many users in the cell, there will be no PUCCH resource allocation for online users.

Contents of the invention

The embodiment of the present invention proposes a data transmission method, which can quickly realize data transmission by using messages to transmit data, and avoid PUCCH resource ping-pong switching of interactive services with small data volumes.

The technical scheme of the embodiment of the present invention is as follows:

A method for data transmission, the method comprising:

When an online user transmits uplink data, a fixed resource authorization is assigned to the uplink data including the group A preamble, and a resource authorization is allocated to the uplink data including the group B preamble according to existing resources;

The message sent by the terminal to the base station on the resource grant carries the cell radio network temporary identifier C-RNTI and uplink data;

According to the C-RNTI, the base station determines that the reason why the online user enters the online state is that there is no data transmission, and the uplink data carried in the message is received.

The allocation of fixed resource grants for uplink data including group A preambles, and allocation of resource grants for uplink data including group B preambles according to existing resources include:

determining the preamble of the uplink data according to the amount of cached data required by the uplink data and power control;

A fixed resource grant is allocated to the uplink data including the group A preamble, and a resource grant is allocated to the uplink data including the group B preamble according to existing resources.

The allocating the resource authorization according to the existing resources includes: allocating the resource authorization according to the scheduling situation of the existing resources.

The method further comprises:

BSR in the message sent by the terminal to the base station on the resource grant;

The base station determines according to the C-RNTI that the online user enters the online state because there is no data transmission, and allocates uplink resources to transmit uplink data according to the BSR.

The method further comprises:

The message sent by the terminal to the base station on the resource grant carries a buffer status report procedure BSR;

After the base station receives the BSR, according to the C-RNTI, it is determined that the online user enters the online state because the SR reaches the maximum number of transmissions;

The base station issues resource authorization again, allocates physical uplink control channel PUCCH resources, and transmits remaining uplink data of online users.

The method further comprises:

The reason why the base station determines that the online user enters the online state according to the C-RNTI is that the SR reaches the maximum number of transmissions, and the message sent to the base station on the resource grant does not carry the BSR;

The base station performs downlink resource authorization for message 4.

From the above technical solutions, it can be seen that when an online user transmits uplink data in the embodiment of the present invention, a fixed resource authorization is assigned to the uplink data including the group A preamble, and a fixed resource grant is assigned to the uplink data including the group B preamble according to the existing resources. Allocate resource authorization; the message sent by the terminal to the base station on the resource authorization carries C-RNTI and uplink data; the base station determines that the reason for the online user to enter the online state according to the C-RNTI is that there is no data transmission, and the uplink data carried in the message is received data. Since the terminal transmits uplink data in the message 3 sent to the base station, data transmission can be quickly realized, and PUCCH resource ping-pong switching of interactive services with small data volumes can be avoided.

Description of drawings

FIG. 1 is a schematic flow chart of a data transmission method.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

In the embodiment of the present invention, the user and the base station perform uplink synchronization through message 1, message 2, message 3 and message 4 during the uplink synchronization process. Make full use of the message 3 sent by the UE to the eNB during the uplink synchronization process. Due to the small amount of data, the user's uplink data is carried in the message 3, instead of using the PUCCH resource to apply for uplink resources to transmit the user's uplink data. Furthermore, it is avoided that the characteristic of the interactive service with a small amount of data causes PUCCH resource ping-pong switching.

Referring to accompanying drawing 1, it is a schematic flow chart of the method for data transmission, which specifically includes the following steps:

101. Data packet

When an online user transmits uplink data, it determines that the uplink data belongs to group A or group B according to the buffered data volume and power control of the uplink data, and identifies it in the preamble of the uplink data. That is, the preamble is used to distinguish the group to which the uplink data belongs. Wherein, determining the group A and the group B according to the cached data volume and power control of the uplink data is the prior art.

102. Resource authorization

During the random access process, the base station distinguishes the group A or group B of the preamble, and performs resource allocation for the message 2 . The base station allocates fixed resource grants to group A according to the inherent scheduling principle; assigns resource grants to group B according to the scheduling situation of existing resources. This process of assigning resource authorizations is known in the art.

103. Data transmission

After receiving the message 2 sent by the base station, the terminal determines whether the message 3 carries the BSR according to the amount of buffered data. If this data transmission can realize all buffered data transmission, then directly generate the transmission unit of C-RNTI+ data to send; if this time cannot realize all buffered data transmission, it will carry the buffer status report process (BSR) that is C-RNTI+ Transmission unit for BSR+ data. The BSR is used to provide the serving eNB with information about the amount of data waiting to be transmitted in the UE's current uplink buffer.

104. Receive data

After receiving the message 3, the base station splits the protocol unit, and receives the uplink data carried in the message 3.

105. Determine the reason for entering the online state, and transmit data.

Determine the reason for entering the online state. If the reason for entering the online state is that there has been no data transmission for a long time, and message 3 does not carry BSR, it means that the data transmission is over. This situation is consistent with the situation of burst data transmission with a small amount of data, so the PUCCH resource and the SRS resource are not allocated, but the uplink data is transmitted using the message 3 .

If the reason for entering the online state is that there has been no data transmission for a long time and the BSR is carried, the eNB performs uplink resource allocation according to the BSR reported by the terminal to transmit uplink data and allocate downlink resources to transmit the response message of message 3 (that is, message 4); The BSR carried by each uplink data allocates resource grants for uplink data transmission until all uplink data transmissions are completed. If the reason for entering the online state is that the SR has reached the maximum number of transmissions, it means that the wireless environment is not good, so it cannot be determined whether it is a burst small data service transmission, and the eNB needs to allocate PUCCH resources to ensure that it is suitable for all service characteristics.

If the reason for entering the online state is that the SR has reached the maximum number of transmissions, and message 3 carries BSR, it means that there is still uplink data to be transmitted, and the eNB allocates PUCCH resources to configure the terminal, realize the process of online activation of the user, and transmit the remaining uplink data.

If the reason for entering the online state is that the SR has reached the maximum number of transmissions and the BSR is not carried, only the downlink resource authorization of message 4 is performed. The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. a method for transfer of data, is characterized in that, described method comprises:

During online user's transmit ascending data, distribute fixing resource authorization for the upstream data comprising group A lead code, for comprising the upstream data of group B lead code according to the mandate of existing resource Resources allocation;

Terminal carries Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI and upstream data on described resource authorization in the message of base station transmission;

According to C-RNTI, base station determines that the reason that online user enters presence does not have transfer of data, receive the upstream data carried in message.

2. the method for transfer of data according to claim 1, is characterized in that, the described upstream data for comprising group A lead code distributes fixing resource authorization, comprises by existing Resourse Distribute resource authorization for the upstream data comprising group B lead code:

The lead code of described upstream data is determined in the buffer data size needed according to upstream data and power control;

Fixing resource authorization is distributed, for comprising the upstream data of group B lead code by existing Resourse Distribute resource authorization for the upstream data comprising group A lead code.

3. the method for transfer of data according to claim 1, is characterized in that, describedly comprises according to the mandate of existing resource Resources allocation: according to the dispatch situation Resources allocation mandate of existing resource.

4. the method for transfer of data according to claim 1, it is characterized in that, described method comprises further:

Terminal on described resource authorization to base station send message in BSR;

According to C-RNTI, base station determines that the reason that online user enters presence does not have transfer of data, that carries out ascending resource according to BSR point is equipped with transmit ascending data.

5. the method for transfer of data according to claim 1, it is characterized in that, described method comprises further:

Terminal carries buffer status report process BSR on described resource authorization in the message of base station transmission;

After base station receives BSR, determine that the reason that online user enters presence is that SR reaches maximum transmission times according to C-RNTI;

Base station down distributing resource mandate again, distributes physical uplink control channel PUCCH resource, the remaining upstream data of transmission online user.

6. the method for transfer of data according to claim 1, it is characterized in that, described method comprises further:

According to C-RNTI, base station determines that the reason that online user enters presence is that SR reaches maximum transmission times, and do not carry BSR in the message sent to base station on described resource authorization;

The downlink resource mandate of message 4 is carried out in base station.