WO2011079662A1

WO2011079662A1 - Random access method, equipment and system

Info

Publication number: WO2011079662A1
Application number: PCT/CN2010/078966
Authority: WO
Inventors: 赵毅; 许芳丽; 赵亚利; 刘佳敏; 梁靖
Original assignee: 电信科学技术研究院
Priority date: 2009-12-31
Filing date: 2010-11-22
Publication date: 2011-07-07
Also published as: CN102014515A; CN102014515B

Abstract

A random access method and equipment are disclosed in the present invention. The method includes: a User Equipment (UE) receives a message from network side equipment, wherein the message carries the information about the newly added carriers; the UE determines whether random access is needed on the newly added carriers, if yes, the UE performs random access on the newly added carriers. By means of applying Radio Resource Control (RRC) command, configuring dedicated Medium Access Control (MAC) entity, or using Physical Downlink Control Channel (PDCCH) 1b, the present invention can trigger the UE which supports carrier aggregation to perform random access on the configured carriers, thus supporting random access to the carrier aggregated UE, and better supporting the carrier aggregation operations in multiple Timing Advances (TAs) scenarios.

Description

The present invention claims to be filed on December 31, 2009, the Chinese Patent Office, the application number is 200910244453.8, the Chinese patent application entitled "A random access method, device and system" Priority is hereby incorporated by reference in its entirety. Technical field

The present invention relates to the field of communications technologies, and in particular, to a random access method, device, and system. Background technique

LTE (Long Term Evolution) is an evolution of 3G (3rd Generation), LTE improves and enhances 3G air access technology, using OFDM (Orthogonal Frequency Division Multiplexing) And MIMO (Multiple Input Multiple Output) as the standard for the evolution of the LTE wireless network.

In the LTE system and the previous wireless communication system, there is only one (or a pair) of carriers in one cell. As shown in FIG. 1 , the maximum bandwidth in the LTE system is 20 MHz; and in the spectrum bandwidth of 20 MHz, LTE can provide The downlink rate of 100 Mbit/s and uplink 50 Mbit/s improves the performance of cell edge users, increases cell capacity and reduces system delay. In addition, in the LTE system, the UE (User Equipment) can work only on one carrier at a time, and one LTE cell has only one carrier, and each LTE cell is identified by a unique number in the network. The UE can only send and receive data in one cell at a time, and the cell is also called a serving cell of the UE.

With the rapid growth of the number of mobile terminal users, the service capacity of end users has increased exponentially. In order to meet the increasing demand of end users, it is necessary to provide more bandwidth to meet the higher peaks required by end users' services and applications. Value rate. In the LTE-A (LTE-Advanced) system, the peak rate of the system is greatly improved compared to LTE, and it is required to achieve downlink 1Gbps and uplink 500Mbps. A carrier with a maximum bandwidth of 20 MHz is obviously unable to meet the peak rate requirement. Therefore, the LTE-A system needs to extend the bandwidth that the terminal user can use. Therefore, the carrier aggregation technology (CA) is introduced, that is, in the same geographical location, multiple UEs are simultaneously received by the carrier aggregation technology or A cell in which data is transmitted, and each cell contains at least one (or a pair) of carriers that can be independently transmitted.

Specifically, multiple cells that can be aggregated can use the same PCI (Physical Layer Cell ID), but the carrier frequencies are different between different cells and CGI.

(Cell Global ID, Global Cell Identity) Different (GCI can also be called ECGI, ie E-UTRAN Cell Global ID). The UE can simultaneously receive and transmit data on multiple (pair) carriers in a plurality of aggregatable cells, thereby increasing the data transmission rate. In order to ensure that the UE of the LTE system can work under each aggregated carrier, it is required that each carrier does not exceed 20 MHz at the maximum. The carrier aggregation technology in the LTE-A system is shown in Figure 2. It is a schematic diagram of the carrier aggregation technology in LTE-A. It can be seen that there are four carriers that can be aggregated under the LTE-A base station. Data transmission is performed on the same carrier and on the same UE to improve the data transmission rate and system throughput of the user.

About time adjustment (Time Alignment, the following tube is called ΤΑ)

Due to the multipath effect and the location of the UE in the wireless propagation environment, the transmission delay of the data sent by the UE to the network side device changes with time, and due to different environments of different users, each UE sends There is also a difference in the transmission delay of the data arriving at the network side device. Therefore, in order to ensure uplink synchronization during data transmission.

(The time when the data sent by the UE reaches the network side device needs to meet the timing requirement of the network side device to receive data.) The time for the UE to send data needs to be adjusted.

In the LTE system, the uplink synchronization is maintained by the network side device, wherein the network side device and the UE each maintain a time adjustment timer (Time Alignment Timer, called TAT), for the RRC (Radio Resource Control, wireless) If the network side device determines that the UE needs to perform time adjustment, it will send a time adjustment command specifically for the UE to the UE.

( Time Alignment Command ). After receiving the time adjustment command sent by the network side device, the UE sends the uplink data of the UE according to the information carried in the time adjustment command. Send time to adjust.

About PDCCH (Physical Downlink Control Channel) lb

In the current LTE-A system, considering the complexity of the PDCCH design, the flexibility of scheduling, and the aggregation of uplink and downlink asymmetric carriers, the design of the PDCCH in the carrier aggregation system includes the following two methods:

Method 1: PDCCH option (option) la. This method is similar to the scheduling mode of the current LTE system, that is, the scheduling among the component carriers is not supported. As shown in FIG. 3, each carrier independently transmits a PDCCH, and the PDCCH can only schedule physical resources of the carrier or corresponding resources in the uplink component carrier with the pairing relationship.

Method 2: PDCCH option lb. As shown in Figure 4, this method supports scheduling of cross-member carriers.

It has been determined that for the LTE-A system, the above two PDCCH control schemes exist in the system, and the specific application scheme will be configured by the network side.

The RACH (Random Access Channel) triggering method for the LTE system.

In the LTE system, uplink synchronization is required for uplink data transmission. If the uplink is in an asynchronous state, uplink synchronization needs to be established through a random access procedure. There are two ways to trigger the UE to perform random access: 1. Trigger by the UE MAC (Media Access Control); 2. Trigger through the PDCCH command received by the UE.

Specifically, the process of triggering random access by the MAC layer includes:

When there is data entering the transmission buffer of the UE, the MAC layer triggers a BSR (Buffer Status Report) report, that is, the eNB (evolved Node B, evolved base station) is notified of the data information that needs to be sent in the current transmit buffer of the UE. After receiving the BSR sent by the UE, the eNB may allocate a corresponding uplink shared channel (UL-SCH) resource to the UE according to the amount of data that the UE needs to send, and notify the UE of the allocated UL- Send data on the SCH resource.

Further, when the UE sends a BSR to the eNB, the UL-SCH resource is also required. If the BSR needs to be reported when there is no UL-SCH, the UE needs to use the dedicated scheduling request resource configured on the physical uplink control channel (Physical Uplink Control Channel, PUCCH) to send the scheduling request (Dedicated Scheduling). Request, the following is called D-SR) or initiate random access to perform SR (Random Access SR, RA-SR), and request the eNB to allocate UL-SCH resources for the BSR to be transmitted.

As the UE is in the uplink out-of-synchronization state, there is no dedicated SR resource allocated to the UE on the PUCCH, that is, the uplink resource request needs to be performed by using the RA-SR, thereby triggering the random access procedure.

The process of triggering random access by the PDCCH command includes:

For the UE that is in the downlink synchronization but the uplink out-of-synchronization state, when there is downlink data arrival (that is, the network side has data to send to the UE), the preamble (preamble) used by the UE to transmit the PDCCH command on the PDCCH is used to notify the UE. The PRACH (Packet Random Access Channel) resource, when the UE receives the corresponding PDCCH command, initiates random access.

About carrier configuration and activation

In the LTE-A system, the configuration of the UE aggregated carrier may adopt two processes of carrier configuration and carrier activation, including:

(1) The UE of LTE-A first performs random access on a certain carrier and enters a connection state;

(2) When the UE's service needs to be transmitted on multiple carriers, the network side will configure multiple carriers for the UE (ie, the carrier configuration process). When the UE receives the configuration message on the network side, there are two possible processing modes: 1) the configuration message is also an activation message; 2) it is considered that only the configuration information of the carrier is received, and if it needs to be transmitted on the carrier The data also needs to receive an activation message for the carrier on the network side.

It should be noted that the above activation means that uplink/downlink synchronization needs to be maintained on the carrier (pair) for uplink and downlink data transmission. When a certain carrier is activated, if the TA adjustment amount of the carrier is different from other carriers, it is necessary to initiate random access on the carrier to establish uplink synchronization. When the active carrier is not used for a long time, it will enter the de-excitation Live state. If the carrier of the deactivated state needs to be activated, it can be activated only by the process of carrier activation. The RRC signaling, the MAC CE (Control Element), the PDCCH command, and the like may be adopted when the carrier is activated.

In the process of implementing the present invention, the inventors have found that at least the following disadvantages exist in the prior art:

In practical applications, a component carrier (Component Carrier, CC) that can be aggregated together for carrier aggregation transmission may have different TAs, if the newly added component carrier and the UE are currently used. When the TAs of the component carriers (that is, the component carriers that are currently transmitting data) are different, the UE needs to perform uplink synchronization on the component carrier before starting to work on the newly added component carriers (that is, performing data transmission).

However, in the current LTE protocol, the UE in the connected state can only trigger the MAC layer because it wants to send a BSR, or it is triggered by receiving a PDCCH command on the network side. For an LTE-A UE that already has a carrier for data transmission, since the UE can obtain the UL-SCH resource for transmitting the BSR at this time, the UE cannot trigger the random access on the newly configured carrier by means of the MAC layer triggering manner. Therefore, the random access procedure of the UE is affected, and the use of the newly configured carrier is affected. Summary of the invention

The present invention provides a random access method, device, and system for triggering a random access procedure on a newly added carrier to a UE in a connected state.

In order to achieve the above object, the embodiment of the present invention provides a random access method, including: a user equipment UE receives a message from a network side device, where the message carries information of a newly added carrier;

The UE determines whether it is necessary to perform random access on the newly added carrier. When the result of the determination is that random access is required on the newly added carrier, the UE performs random access on the newly added carrier. .

The embodiment of the invention provides a random access device, including: a receiving module, configured to receive a message from a network side device, where the message carries information about a newly added carrier;

a determining module, configured to determine whether random access is required on the newly added carrier, and a processing module, configured to: when the result of the determination is that random access is required on the newly added carrier, on the added carrier Perform random access.

The embodiment of the invention provides a random access method, including:

The network side device acquires information about the newly added carrier corresponding to the UE, where the newly added carrier is a carrier that needs to provide an aggregation service for the UE;

The network side device sends a message to the UE, where the message carries the information of the newly added carrier; the UE determines whether it needs to perform random access on the newly added carrier, and needs to be in the When the random access is performed on the newly added carrier, the UE performs random access on the newly added carrier.

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

An acquiring module, configured to acquire information about a newly added carrier corresponding to the UE, where the newly added carrier is a carrier that needs to provide an aggregation service for the UE;

a sending module, configured to send a message to the UE, where the message carries information about the newly added carrier; and the UE determines whether it is required to perform random access on the newly added carrier, and needs to be in the When the random access is performed on the newly added carrier, the UE performs random access on the newly added carrier.

The embodiment of the present invention provides a random access system, which includes: a network side device, configured to send a message to a UE, where the message carries information about a newly added carrier;

The UE is configured to determine whether random access is required on the newly added carrier, and when the result of the determination is that random access is required on the newly added carrier, random access is performed on the newly added carrier.

Compared with the prior art, the present invention has at least the following advantages:

In the present invention, the UE supporting the carrier aggregation is triggered to perform random access on the configured carrier by using the RRC command or setting the dedicated MAC entity or adopting the PDCCH lb, thereby supporting the carrier aggregation UE to perform random access, and is better. Supported more Carrier aggregation operation in the TA scenario. DRAWINGS

1 is a schematic diagram of only one carrier in a cell in a LTE system in the prior art; FIG. 2 is a schematic diagram of a carrier aggregation technology in the prior art LTE-A;

FIG. 3 is a schematic diagram of the prior art that does not support scheduling between component carriers; FIG. 4 is a schematic diagram of supporting scheduling between component carriers in the prior art;

5 is a schematic flowchart of a random access method according to Embodiment 1 of the present invention; FIG. 6 is a schematic flowchart of a random access method according to Embodiment 2 of the present invention; FIG. 7 is a schematic diagram of Embodiment 3 of the present invention. FIG. 8 is a schematic flowchart of a random access method according to Embodiment 4 of the present invention; FIG. 9 is a schematic structural diagram of a random access device according to an embodiment of the present invention; A schematic diagram of a network side device structure provided by the example. detailed description

In the embodiment of the present invention, after the UE receives the message of the network side device (for example, the RRC connection reconfiguration message), the information about the newly added carrier is obtained, where the newly added carrier needs to provide the aggregation service for the UE. The carrier can then determine whether random access needs to be performed on the newly added carrier. When random access is required on the newly added carrier, the UE can trigger by using an RRC command or setting a dedicated MAC entity or adopting a PDCCH lb. The UE that supports carrier aggregation performs random access on the configured carrier, thereby supporting the carrier aggregation UE to perform random access, and better supporting the carrier aggregation operation in the multi-TA scenario.

As shown in FIG. 5, the first embodiment of the present invention provides a random access method, including the following steps:

Step 501: The user equipment UE receives a message from a network side device, where the message carries information about a newly added carrier.

Step 502: The UE determines whether it is required to perform random connection on the added carrier. In. When the result of the judgment is that random access needs to be performed on the newly added carrier, go to the step

503, otherwise, the process ends.

Specifically, the determining, by the UE, whether the random access needs to be performed on the newly added carrier includes one or more of the following contents: (1) the UE determines whether the added carrier is the same as the activated carrier. a frequency band range, when the new carrier belongs to the same frequency band range as the activated carrier, the UE determines that random access is not required on the newly added carrier; otherwise, the UE determines that it needs to be in Performing random access on the newly added carrier; (2) the UE determines whether the newly added carrier signal and the activated carrier signal are transmitted through the same transmission device, when the newly added carrier signal and the activated carrier signal pass the same When the transmission device transmits, the UE determines that the random access is not required to be performed on the newly added carrier; otherwise, the UE determines that random access needs to be performed on the newly added carrier;

(3) The UE determines, according to the indication information of the network side device, whether to perform random access on the newly added carrier, and when the indication information indicates that the UE performs random access on the added carrier The UE determines that random access needs to be performed on the newly added carrier; otherwise, the UE determines that random access is not required on the newly added carrier. The indication information is implemented by setting the indication bit, or by using a bitmap, or by directly indicating the carrier index, the frequency point information, or the cell information corresponding to the carrier that needs to be or does not need to perform random access. Other ways to achieve.

Step 503: The UE performs random access on the newly added carrier.

Specifically, the performing random access by the UE on the newly added carrier includes: (1) the UE transmitting a random access indication to a media access control MAC and/or a physical layer by using a radio resource control RRC layer; And/or the physical layer performs random access on the added carrier according to the random access indication. (2) the UE instructs the MAC layer to associate the dedicated entity with the newly added carrier through the RRC layer; when data appears in the dedicated entity, the dedicated entity performs on the newly added carrier having an association relationship Random access. (3) The UE receives, from the network side device, information indicating that the UE performs uplink synchronization and/or random access on the newly added carrier by using a PDCCH lb manner; the UE according to the PDCCH lb mode The indication is randomly connected on the added carrier In.

It can be seen that, by using the method provided by the present invention, the UE supporting the carrier aggregation is triggered to perform random access on the configured carrier by using the RRC command or setting the dedicated MAC entity or adopting the PDCCH lb, so that the UE supporting the carrier aggregation performs randomization. Access, and better support carrier aggregation operations in multiple TA scenarios. In order to better support the LTE-A UE in the connected state, a random access procedure is triggered on the newly added aggregated carrier. In the embodiment of the present invention, several methods for triggering random access are proposed.

(1) Use the RRC command to trigger random access.

Specifically, when the UE receives the RRC message that is sent by the network side device and includes the carrier configuration information, when the UE needs to perform random access on the newly added carrier, the UE sends a command or an indication to the lower layer (the MAC and/or the physical layer). Trigger the lower layer for random access.

(2) Setting a dedicated entity at the MAC layer to trigger random access.

By setting up a dedicated entity (for example, a buffer) at the MAC layer, when data is received in the buffer, random access is initiated on the corresponding carrier.

(3) Improve the way the PDCCH command triggers random access.

The random access of the corresponding carrier is triggered by the PDCCH command received on the other carriers in the PDCCH lb mode.

Of course, in the actual application, the foregoing method is not limited to the method of triggering random access. In the embodiment of the present invention, the foregoing manner is taken as an example for description.

In order to explain the above manner more clearly, the second embodiment of the present invention provides a random access method, which is used to trigger a random access procedure by using an RRC command in an LTE-A system, as shown in FIG. Steps:

Step 601: The network side device sends an RRC connection reconfiguration message to the UE. The network side device includes, but is not limited to, an RNC (Radio Network Controller), an NB (Node B, a Node B), an eNB, a relay, a base station, and the like. Not limited to the above devices, all devices on the network side are within the scope of the present invention. Specifically, the RRC connection reconfiguration message includes configuration information of the newly added carrier of the UE, and the RRC connection reconfiguration message may further include resource configuration information when the random access is initiated on the newly added carrier.

The resource configuration information includes, but is not limited to, random access indication information, a preamble index, a PRACH resource location, and the like. The resource configuration information may be implemented by setting a dedicated IE (Information Elements) at the RRC layer.

Further, the random access indication information is used to indicate whether random access needs to be performed on the newly added carrier. In the embodiment of the present invention, the indication may be performed by setting the indication bit. In the case of multiple carriers, the indication may be performed by using a bitmap. Of course, in actual applications, other manners may also be used for indication, for example, direct indication needs or The carrier index, the frequency point information, or the cell information corresponding to the carrier are not required to be used for the random access, and the indication manner is not described in the embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, the information is not limited to be carried by using the RRC connection reconfiguration message, and any message that can carry the foregoing information is within the protection scope of the present invention. For example, the UE can be carried by the message A. Add carrier configuration information and resource configuration information. In addition, the configuration information and the resource configuration information of the newly added carrier of the UE may be sent to the UE by using the same message, or may be sent to the UE by using different messages, which are not repeatedly described in the embodiment of the present invention, to reconfigure the message through the RRC connection. The configuration information and resource configuration information of the newly added carrier of the UE are sent to the UE as an example for description.

Step 602: After receiving the foregoing RRC connection reconfiguration message, the UE determines whether a random access procedure needs to be initiated on the newly added carrier. When the result of the determination is YES, the process goes to step 603, otherwise, the process ends.

The UE may judge whether it is necessary to perform random access on the newly added carrier according to one or more of the following contents.

(1) Whether the carrier to be activated (ie, the newly added carrier) belongs to the same frequency band range as the activated carrier.

Specifically, when the newly added carrier belongs to the same frequency band as the activated carrier, it is determined that random access is not required for the newly added carrier; otherwise, it is determined that random access is required for the newly added carrier. (2) Whether the carrier signal to be activated and the activated carrier signal are transmitted through the same transmission device. The transmission device includes but is not limited to a repeater, a relay node or other type of amplifier or the like.

Specifically, when the carrier signal to be activated and the activated carrier signal are transmitted through the same transmission device, it is determined that random access is not required for the newly added carrier; otherwise, it is determined that random access is required for the newly added carrier.

(3) determining, according to the indication information included in the received network side message (eg, RRC connection reconfiguration message), whether a random access procedure needs to be initiated on the newly added carrier.

Specifically, when the indication information indicates that the UE performs random access on the newly added carrier, it is determined that random access is required for the newly added carrier, otherwise, it is determined that random access is not required for the newly added carrier. When the network side configures multiple carriers at the same time, according to actual needs, some carriers may be randomly accessed, and some carriers may not be randomly accessed.

Step 603: The RRC layer sends a random access command or indication to the lower layer. The lower layer includes a MAC layer and/or a physical layer.

Specifically, the random access command or indication may be arbitrarily selected according to actual needs, and only information that needs to initiate a random access procedure on the newly added carrier may be sent to the MAC layer and/or the physical layer.

Step 604: The MAC and/or the physical layer initiate random access after receiving the command or indication of the RRC layer.

It should be noted that the command or indication of the RRC layer may indicate that random access is performed on multiple carriers at the same time. At this time, the MAC and/or the physical layer will initiate random access on multiple carriers.

It can be seen that, by using the method provided by the present invention, the UE supporting the carrier aggregation is triggered by the RRC command to perform random access on the configured carrier, thereby supporting the carrier aggregation UE to perform random access, and better supporting the multi-TA scenario. Carrier aggregation operation. A third embodiment of the present invention provides a random access method, which is used to set a dedicated entity at the MAC layer to trigger a random access procedure in an LTE-A system, as shown in FIG. 7. As shown, the following steps are included:

Step 701: The network side device sends an RRC connection reconfiguration message to the UE.

Specifically, the RRC connection reconfiguration message includes configuration information of the newly added carrier of the UE and resource configuration information when the random access is initiated on the newly added carrier. The resource configuration information includes, but is not limited to, random access indication information, a preamble index, a PRACH resource location, and the like. The foregoing resource configuration information can be implemented by setting a special IE at the RRC layer. Further, the random access indication information is used to indicate whether random access needs to be performed on the newly added carrier. In the embodiment of the present invention, the indication may be performed by setting the indication bit. In the case of multiple carriers, the indication may be performed by using a bitmap. Of course, in an actual application, other manners may be used for indication, for example, direct indication of need or The carrier index, the frequency point information, or the cell information corresponding to the carrier are not required to be used for the random access, and the indication manner is not described in the embodiment of the present invention.

Step 702: After receiving the foregoing RRC connection reconfiguration message, the UE determines whether a random access procedure needs to be initiated on the newly added carrier. When the result of the determination is YES, the process goes to step 703, otherwise, the process ends.

Step 703: The RRC layer instructs the MAC layer to put a specific RRC message (for example, an RRC connection reconfiguration complete message) into the dedicated entity. The dedicated entity may be arbitrarily selected according to actual needs. For example, the dedicated entity may be a cache. Area.

Specifically, the RRC message carries an association relationship between the dedicated entity and the carrier. Step 704: After data appears in the dedicated entity, random access is initiated on the carrier with the associated relationship.

It should be noted that the dedicated entity may be a dedicated entity set for each aggregative carrier or a carrier indicated by the RRC; or may be a dedicated entity shared by multiple carriers; and when there is data in the dedicated entity, Random access needs to be initiated on all carriers associated with the dedicated entity.

It can be seen that, by using the method provided by the present invention, the UE supporting the carrier aggregation is triggered to perform random access on the configured carrier by setting a dedicated MAC entity, so that the UE supporting the carrier aggregation performs random access and better supports. Carrier aggregation operation in a multi-TA scenario. Embodiment 4 of the present invention proposes a random access method, which is directed to LTE-A. In the embodiment of the present invention, the carrier (pair) configured for the UE is assumed to be CC1, CC2, and CC3. The carrier (pair) for uplink synchronization and data transmission and reception is CC1. In order to transmit uplink data on CC2 and CC3, uplink synchronization needs to be performed on CC2 and CC3. As shown in Figure 8, the following steps are included:

Step 801: The network side device sends an RRC connection reconfiguration message to the UE.

Step 802: The network side device indicates, by using the PDCCH lb on the CC1, that the UE performs uplink synchronization and/or random access on CC2 and/or CC3.

Specifically, the network side device may add the index information of CC2 and/or CC3 in the corresponding PDCCH order to instruct the UE to perform uplink synchronization and/or random access on CC2 and/or CC3.

It should be noted that the network side device may be indicated in the same PDCCH command. The UE performs uplink synchronization and/or random access on CC2 and CC3, and may also instruct the UE to perform uplink synchronization and/or random access on CC2 and CC3 in different PDCCH commands.

Step 803: After receiving the PDCCH command on the CC1, the UE configures CC2 and/or CC3 by using the configuration information in the received RRC connection reconfiguration message, and performs random access on CC2 and/or CC3.

Specifically, after receiving the RRC connection reconfiguration message from the network side, the UE may configure CC2 and/or CC3 according to the configuration information in the RRC connection reconfiguration message; after the UE receives the PDCCH command on the CC1, Random access can be performed on CC2 and/or CC3 based on the results of configuring CC2 and/or CC3. It can be seen that the process of configuring CC2 and/or CC3 may be before receiving the PDCCH command or after receiving the PDCCH command.

Specifically, after receiving the PDCCH command on the CC1, the UE may instruct the UE to perform random access on the corresponding carrier, which is described in detail in the following three cases.

In the first case, the network side device indicates that the UE performs random access on CC2 and/or CC3 by using PDCCH lb on CC1. The index information of CC2 and/or CC3 is added to the PDCCH command to indicate that the UE performs random access on CC2 and/or CC3, so that the UE may be instructed to perform random access on CC2 and/or CC3.

In the second case, the network side device indicates that the UE performs uplink synchronization on CC2 and/or CC3 by using PDCCH lb on CC1. In this case, if uplink synchronization is required through random access, random access needs to be initiated on the corresponding carrier. If the uplink synchronization is not required by the random access, the processing in this case is not described in detail in the embodiment of the present invention.

In the third case, the network side device uses the PDCCH lb on CC1 to indicate that the UE performs uplink synchronization and random access on CC2 and/or CC3. The index information of CC2 and/or CC3 is added to the PDCCH command to instruct the UE to perform random access on CC2 and/or CC3, so that the UE can be instructed to perform random access on CC2 and/or CC3.

In this embodiment of the present invention, the UE may determine according to one or more of the following contents: Whether uplink synchronization needs to be performed by random access on the corresponding carrier.

Specifically, when the newly added carrier belongs to the same frequency band as the activated carrier, it is determined that random access is not required for the newly added carrier; otherwise, it is determined that random access is required for the newly added carrier.

(2) Whether the carrier signal to be activated and the activated carrier signal are transmitted through the same transmission device. The transmission device includes but is not limited to a repeater, a relay node or other type of amplifier.

It can be seen that, by using the method provided in the embodiment of the present invention, the UE supporting the carrier aggregation is triggered to perform random access on the configured carrier by using the PDCCH lb, thereby supporting the carrier aggregation UE to perform random access, and is better. The carrier aggregation operation in the multi-TA scenario is supported. As shown in FIG. 9, a random access device according to an embodiment of the present invention includes: a receiving module 91, configured to receive a message from a network side device, where the message carries information of a newly added carrier.

The determining module 92 is configured to determine whether a random connection needs to be performed on the added carrier The determining module 92 is specifically configured to determine whether the newly added carrier belongs to the same frequency band range as the activated carrier, and when the added carrier and the activated carrier belong to the same frequency band, it is determined that the new carrier does not need to be in the same frequency range. Perform random access on the newly added carrier; otherwise, determine that random access needs to be performed on the newly added carrier; and determine whether the newly added carrier signal and the activated carrier signal are transmitted through the same transmission device, when the new When the carrier signal and the activated carrier signal are transmitted through the same transmission device, it is determined that random access is not required on the newly added carrier; otherwise, it is determined that random access is required on the newly added carrier; Determining whether the device needs to perform random access on the newly added carrier, and determining, when the indication information indicates that the UE performs random access on the newly added carrier, determining that the newly added carrier is required. Random access is performed; otherwise, it is determined that random access is not required on the newly added carrier. The indication information is implemented by setting the indication bit, or by using a bitmap. In practice, the implementation may be implemented in other manners, for example, directly indicating the carrier index that needs or does not need to perform random access. , frequency point information or cell information corresponding to the carrier.

The processing module 93 is configured to perform random access on the newly added carrier when the result of the determination is that random access needs to be performed on the newly added carrier.

The processing module 93 is specifically configured to: send, by using an RRC layer, a random access indication to the MAC and/or the physical layer, where the MAC and/or the physical layer perform randomization on the newly added carrier according to the random access indication. Access.

The processing module 93 is specifically configured to: the UE instructs the MAC layer to associate the dedicated entity with the newly added carrier by using an RRC layer; when data occurs in the dedicated entity, the dedicated entity is in the associated relationship. Random access is performed on the newly added carrier.

The processing module 93 is specifically configured to: receive information from the network side device that indicates that the UE performs uplink synchronization and/or random access on the newly added carrier by using a PDCCH lb manner; and according to the PDCCH lb The indication of the mode performs random access on the added carrier.

Wherein, the modules of the device of the present invention may be integrated or integrated. The above modules can be combined into one module, or can be further split into multiple sub-modules.

It can be seen that by using the device provided by the present invention, the RRC command or the setting is dedicated. The MAC entity or the PDCCH lb mode triggers the UE that supports the carrier aggregation to perform random access on the configured carrier, thereby supporting the carrier aggregation UE to perform random access, and better supporting the carrier aggregation in the multi-TA scenario. operating. As shown in FIG. 10, a network side device according to an embodiment of the present invention includes: an obtaining module 1001, configured to acquire information about a newly added carrier corresponding to a UE, where the newly added carrier needs to provide an aggregation for the UE. Carrier of the service.

The sending module 1002 is configured to send a message to the UE, where the message carries information about the newly added carrier, and the UE determines whether it is required to perform random access on the newly added carrier, and needs to be in the When the random access is performed on the newly added carrier, the UE performs random access on the newly added carrier.

The sending module 1002 is further configured to send the indication information to the UE, where the indication information is used to indicate whether the UE needs to perform random access on the newly added carrier, where the indication information is set by using an indication bit. The implementation of the method may be implemented by using a bitmap, or may be implemented in other manners, for example, directly indicating a carrier index, frequency point information, or cell information corresponding to a carrier that requires or does not need to perform random access.

The sending module 1002 is further configured to indicate, by using a PDCCH lb manner, that the UE performs uplink synchronization and/or random access on the newly added carrier.

It can be seen that, by using the device provided by the present invention, the UE supporting the carrier aggregation is triggered to perform random access on the configured carrier by using the RRC command or setting the dedicated MAC entity or adopting the PDCCH lb, so that the UE supporting the carrier aggregation performs random access. Access, and better support carrier aggregation operations in multiple TA scenarios. A random access system is also proposed in the embodiment of the present invention, including:

a network side device, configured to send a message to the UE, where the message carries information about the newly added carrier; The UE is configured to determine whether random access is required on the newly added carrier, and when the result of the determination is that random access is required on the newly added carrier, random access is performed on the newly added carrier.

The UE is specifically configured to determine whether the newly added carrier belongs to the same frequency band range as the activated carrier, and when the added carrier and the activated carrier belong to the same frequency band, it is determined that the Random access is performed on the newly added carrier; otherwise, it is determined that random access needs to be performed on the newly added carrier;

Determining whether the newly added carrier signal and the activated carrier signal are transmitted through the same transmission device, and when the newly added carrier signal and the activated carrier signal are transmitted by the same transmission device, determining that the new carrier is not required to be performed on the newly added carrier Random access; otherwise, it is determined that random access needs to be performed on the newly added carrier;

Determining, according to the indication information of the network side device, whether to perform random access on the newly added carrier; when the indication information indicates that the UE performs random access on the newly added carrier, determining that Random access is performed on the newly added carrier; otherwise, it is determined that random access is not required on the newly added carrier.

It can be seen that, by using the system provided by the present invention, the UE supporting the carrier aggregation is triggered to perform random access on the configured carrier by using the RRC command or setting the dedicated MAC entity or adopting the PDCCH lb, so that the UE supporting the carrier aggregation performs randomization. Access, and better support carrier aggregation operations in multiple TA scenarios. Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a A computer device (which may be a personal computer, a server, or a network device, etc.) performs the methods described in various embodiments of the present invention.

A person skilled in the art can understand that the drawings are only a schematic diagram of a preferred embodiment, and the modules or processes in the drawings are not necessarily required to implement the invention. Those skilled in the art can understand that the modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or the corresponding changes may be located in one or more apparatuses different from the embodiment. The modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments. The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

Rights request

A random access method, comprising:

The user equipment UE receives a message from the network side device, where the message carries information of the newly added carrier;

2. The method according to claim 1, wherein the determining, by the UE, whether the random access needs to be performed on the newly added carrier comprises one or more of the following contents: the UE determines the new Whether the enhanced carrier belongs to the same frequency band range as the activated carrier, and when the newly added carrier belongs to the same frequency band range as the activated carrier, the UE determines that random access is not required on the newly added carrier. Otherwise, the UE determines that random access needs to be performed on the added carrier;

Determining, by the UE, whether the newly added carrier signal and the activated carrier signal are transmitted by using the same transmission device, and when the newly added carrier signal and the activated carrier signal are transmitted by using the same transmission device, the UE determines that the UE does not need to be in the Random access is performed on the newly added carrier; otherwise, the UE determines that random access needs to be performed on the newly added carrier;

Determining, according to the indication information of the network side device, whether to perform random access on the newly added carrier, and when the indication information indicates that the UE performs random access on the newly added carrier, The UE determines that random access needs to be performed on the newly added carrier; otherwise, the UE determines that random access is not required on the newly added carrier.

The method according to claim 2, wherein the indication information is implemented by setting a pointer, or by using a bitmap.

The method according to claim 1, wherein the performing random access by the UE on the newly added carrier comprises:

The UE sends a random access indication to the media access control MAC and/or the physical layer by using a radio resource control RRC layer;

The MAC and/or physical layer according to the random access indication in the newly added carrier Random access is performed on it.

The UE instructs the MAC layer to associate the dedicated entity with the newly added carrier through the RRC layer;

When data occurs in the dedicated entity, the dedicated entity performs random access on the newly added carrier having an association relationship.

Receiving, by the UE, the information about the uplink synchronization and/or random access performed by the UE on the newly added carrier by using the PDCCH lb mode from the network side device;

The UE performs random access on the newly added carrier according to the indication of the PDCCH lb mode.

7. A random access device, comprising:

a receiving module, configured to receive a message from a network side device, where the message carries information about a newly added carrier;

8. Apparatus according to claim 7 wherein:

The determining module is specifically configured to: determine whether the newly added carrier belongs to the same frequency band range as the activated carrier, and when the added carrier and the activated carrier belong to the same frequency band, determining that the Random access is performed on the newly added carrier; otherwise, it is determined that random access needs to be performed on the newly added carrier;

Determining whether the newly added carrier signal and the activated carrier signal are transmitted through the same transmission device, and when the newly added carrier signal and the activated carrier signal are transmitted through the same transmission device, determining that the new carrier is not required to be randomly performed Accessing; otherwise, determining that random access needs to be performed on the added carrier; Determining, according to the indication information of the network side device, whether to perform random access on the newly added carrier; when the indication information indicates that the UE performs random access on the newly added carrier, determining that Random access is performed on the newly added carrier; otherwise, it is determined that random access is not required on the newly added carrier.

9. Apparatus according to claim 7 wherein:

The processing module is specifically configured to: send, by using an RRC layer, a random access indication to a MAC and/or a physical layer; and perform random connection on the newly added carrier by the MAC and/or the physical layer according to the random access indication. In.

10. Apparatus according to claim 7 wherein:

The processing module is specifically configured to: by using an RRC layer, instruct the MAC layer to associate the dedicated entity with the newly added carrier; when data occurs in the dedicated entity, the dedicated entity has the added relationship in the associated relationship. Random access is performed on the carrier.

11. Apparatus according to claim 7 wherein:

The processing module is specifically configured to: receive information from the network side device that indicates that the UE performs uplink synchronization and/or random access on the newly added carrier by using a PDCCH lb manner; and according to the PDCCH lb mode The indication is to perform random access on the added carrier.

12. A random access method, comprising:

The method according to claim 12, after the acquiring, by the network side device, the information about the newly added carrier corresponding to the UE, the method further includes:

The network side device sends the indication information to the UE, where the indication information is used to indicate whether the UE needs to perform random access on the newly added carrier; The information is implemented by setting the indication bit, or by using a bitmap.

The method of claim 12, after the acquiring, by the network side device, the information about the newly added carrier corresponding to the UE, the method further includes:

The network side device indicates, by using a PDCCH lb manner, that the UE performs uplink synchronization and/or random access on the newly added carrier.

15. A network side device, comprising:

16. The network side device according to claim 15, wherein:

The sending module is further configured to: send the indication information to the UE, where the indication information is used to indicate whether the UE needs to perform random access on the newly added carrier, where the indication information is set by using an indication bit. The way to achieve, or, using a bitmap implementation.

17. The network side device according to claim 15, wherein:

The sending module is further configured to indicate, by using a PDCCH lb manner, that the UE performs uplink synchronization and/or random access on the newly added carrier.

18. A random access system, comprising:

a network side device, configured to send a message to the UE, where the message carries information about the newly added carrier;