CN107800523B - Method and apparatus for configuring random access channel resources - Google Patents
Method and apparatus for configuring random access channel resources Download PDFInfo
- Publication number
- CN107800523B CN107800523B CN201610801556.XA CN201610801556A CN107800523B CN 107800523 B CN107800523 B CN 107800523B CN 201610801556 A CN201610801556 A CN 201610801556A CN 107800523 B CN107800523 B CN 107800523B
- Authority
- CN
- China
- Prior art keywords
- subframe
- uplink
- candidate configuration
- terminal device
- predetermined
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0066—Requirements on out-of-channel emissions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
Embodiments of the present disclosure relate to methods and apparatus for configuring random access channel resources. At a network device, candidate configurations of uplink subframes for transmitting preambles may be determined under a plurality of predetermined conditions, the predetermined conditions relating to uplink or downlink transmission conditions. An indication of the configuration may then be sent to the terminal device, such that the terminal device configures the uplink subframes available for random access according to the indication. The terminal device may accordingly select an uplink subframe for transmitting the preamble according to the currently fulfilled condition.
Description
Technical Field
Embodiments of the present disclosure relate generally to communication technology and, more particularly, to a method and apparatus for configuring random access channel resources.
Background
Currently, in the eLAA (licensed assisted spectrum access) technique of R14, during a non-contention RA (random access) procedure, a network device may send a PDCCH (physical downlink control channel) instruction to a terminal device to trigger a preamble transmission on one or more allocated PRACH (physical random access channel) resources in a pre-configured resource pool according to a specified preamble ID.
In a conventional random access procedure, available PRACH resources (including frequency domain resources, sequence set, time domain resources) in one data frame of a carrier are pre-configured and assigned to a terminal device by RRC (radio resource control) configuration. The time domain PRACH resources available for PRACH transmission are configured by RRC as PRACH configuration index. Then, by combining the PDCCH order reception time and the PRACH configuration Index (which is indicated as a 4-bit "PRACH Mask Index" in the PDCCH order), the actual PRACH resource used by the terminal device for transmitting the PRACH is determined in the configured PRACH resources. Thus, in conventional LTE systems, the available PRACH resources are restricted by the RRC configuration to a certain subframe or subframes.
However, since the preamble in the RACH procedure of the eLAA carrier is transmitted on an unlicensed carrier, uncertain LBT (listen before talk) results may delay the random access procedure. In addition, a fixed or semi-static PRACH resource configuration also increases access time, since the UL (uplink)/DL (downlink) configuration in eLAA may change from one transport block to another. For frame structure type 2, PRACH resources in the time domain are constrained by DL/UL configuration. Since any subframe in the eLAA may be either a UL subframe or a DL subframe, such resource indication based on DL/UL configuration is not sufficient. Thus, situations may arise where semi-static resource configurations conflict with dynamic UL subframes.
Disclosure of Invention
In general, the present disclosure provides methods and apparatus for configuring random access channel resources.
In a first aspect, embodiments of the present disclosure provide a communication method. The method comprises the following steps: determining, at a network device, a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions, the predetermined conditions relating to uplink or downlink transmission conditions; and sending an indication of the configuration to the terminal device, such that the terminal device configures the uplink subframe according to the indication.
In a second aspect, embodiments of the present disclosure provide a method of communication. The method comprises the following steps: receiving, at a terminal device, an indication of a candidate configuration of an uplink subframe for transmission of a preamble under a plurality of predetermined conditions from a network device; determining a condition of a plurality of predetermined conditions to be met based on uplink or downlink transmission conditions at the terminal device; and selecting a candidate configuration from the candidate configurations based on the candidate configurations corresponding to the indication and the satisfied condition so as to set an uplink subframe for transmitting the preamble.
In a third aspect, embodiments of the present disclosure provide a network device. The network device includes: a controller configured to determine a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions, the predetermined conditions relating to uplink or downlink transmission conditions; and a transceiver configured to transmit an indication of the configuration to the terminal device, such that the terminal device configures the uplink subframe in accordance with the indication.
In a fourth aspect, embodiments of the present disclosure provide a terminal device. The terminal device includes: a transceiver configured to receive, from a network device, an indication of a candidate configuration of an uplink subframe for transmission of a preamble under a plurality of predetermined conditions; and a controller configured to determine a condition that is satisfied from among a plurality of predetermined conditions based on an uplink or downlink transmission condition at the terminal device, and select a candidate configuration from among the candidate configurations based on the candidate configuration that indicates a correspondence with the satisfied condition so as to set an uplink subframe for transmitting the preamble.
As will be understood from the following description, according to the embodiments of the present disclosure, by configuring the correspondence between the uplink or downlink transmission condition at the terminal device and a plurality of candidate configurations on the network device side, the terminal device flexibly configures uplink resources for transmitting a preamble required for random access based on the actual transmission condition of the uplink or downlink according to the correspondence, thereby avoiding the delay of the random access procedure as described above, improving the success rate of PRACH transmission, and reasonably allocating channel resources for random access.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:
FIG. 1 illustrates an example communication network in which embodiments of the present disclosure may be implemented;
fig. 2 illustrates a high-level piping diagram of a network device signaling interaction with one terminal device for PRACH transmission, in accordance with certain embodiments of the present disclosure;
FIG. 3 illustrates a flow chart of an example communication method in accordance with certain embodiments of the present disclosure;
fig. 4 illustrates a schematic diagram of determining a first candidate configuration for transmitting a preamble in which an uplink subframe is located after a predetermined subframe, according to some embodiments of the present disclosure;
fig. 5 illustrates a schematic diagram of determining a second candidate configuration for an uplink subframe for transmitting a preamble to be located in a special subframe, in accordance with certain embodiments of the present disclosure;
fig. 6 illustrates a flow chart of an example communication method in accordance with certain other embodiments of the present disclosure;
FIG. 7 illustrates a block diagram of an apparatus according to certain embodiments of the present disclosure;
FIG. 8 illustrates a block diagram of an apparatus according to certain embodiments of the present disclosure; and
fig. 9 illustrates a block diagram of an apparatus in accordance with certain embodiments of the present disclosure.
Throughout the drawings, the same or similar reference numbers refer to the same or similar elements.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
The term "network device" as used herein refers to a base station or other entity or node having a particular function in a communication network. A "base station" (BS) may represent a node B (NodeB or NB), an evolved node B (eNodeB or eNB), a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a relay, or a low power node such as a pico base station, a femto base station, or the like. In the context of the present disclosure, the terms "network device" and "base station" may be used interchangeably for purposes of discussion convenience, and may primarily be referred to as an eNB as an example of a network device.
The term "terminal equipment" or "user equipment" (UE) as used herein refers to any terminal equipment capable of wireless communication with a base station or with each other. As an example, the terminal device may include a Mobile Terminal (MT), a Subscriber Station (SS), a Portable Subscriber Station (PSS), a Mobile Station (MS), or an Access Terminal (AT), and the above-described devices in a vehicle. In the context of the present disclosure, the terms "terminal device" and "user equipment" may be used interchangeably for purposes of discussion convenience.
The terms "include" and variations thereof as used herein are inclusive and open-ended, i.e., "including but not limited to. The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Relevant definitions for other terms will be given in the following description.
Since the carrier used for transmitting the preamble is not authorized in the RA procedure of the eLAA carrier, the uplink/downlink configuration in the eLAA may change from one transmission data block to another. Therefore, the conventional fixed or semi-static PRACH resource allocation cannot adapt to the actual transmission situation of the uplink or downlink that changes with time, and the delay of the random access procedure is easily caused.
To solve this problem, one way is to not limit the subframes available for PRACH transmission, since the channel acquisition of the network device's PDCCH order transmission or the terminal device's PRACH transmission in a preconfigured subframe is not guaranteed. In other words, this approach suggests that the terminal device transmits PRACH in any subframe determined by a given time, which is the time from which the PDCCH order reception time offset is received. This means that the time domain resources (subframes) can be dynamically specified (e.g. by PRACH mask index) in the PDCCH order that triggers the RACH procedure. However, the RACH procedure involves potentially multiple preamble transmissions with power ramping. And may also require additional PDCCH order for PRACH retransmission. In addition, in order to support the competitive random access procedure in further LAA (independent LAA or multi-connection LAA) or Multefire system, this approach may generate a great waste of resources due to its unreasonable resource reservation approach.
Therefore, there is a need for an efficient way to efficiently allocate random access channel resources for PRACH transmission. To address these and other potential problems, at least in part, embodiments of the present disclosure provide entirely new communication methods and corresponding devices.
In general, according to embodiments of the present disclosure, a network device may determine a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions, where the predetermined conditions relate to uplink or downlink transmission conditions. The network device may then transmit an indication of the configuration to the terminal device, such that the terminal device configures the uplink subframe in accordance with the indication. It should be noted that the indication includes a corresponding relationship between the corresponding uplink or downlink transmission condition and the corresponding candidate configuration, and the terminal device may learn the corresponding relationship from the indication and perform the uplink channel (e.g., PRACH) resource configuration for transmitting the preamble determined in the corresponding relationship according to the actual transmission condition.
That is, by configuring the correspondence between the uplink or downlink transmission condition at the terminal device and the plurality of candidate configurations on the network device side, the terminal device is made to flexibly configure uplink resources for transmitting the preamble required for random access based on the actual transmission situation of the uplink or downlink according to the correspondence. In this way, it is possible to avoid the delay of the random access procedure as described above, improve the success rate of PRACH transmission, and reasonably allocate channel resources for random access.
Fig. 1 illustrates an example communication network 100 in which embodiments of the present disclosure may be implemented. As shown in fig. 1, the communication network 100 includes a network device 130 and a plurality of terminal devices, i.e., a first terminal device 110 and a second terminal device 120. These terminal devices 110, 120 may communicate with a network device 130. It should be understood that the number of network devices and terminal devices shown in fig. 1 is for illustration purposes only and is not intended to be limiting. Communication network 100 may include any suitable number of network devices and terminal devices. In particular, embodiments of the present disclosure, which will be described below, may be fully applicable to a single user equipment.
Communications in network 100 may be implemented in accordance with any suitable communication protocol, including, but not limited to, first-generation (1G), second-generation (2G), third-generation (3G), fourth-generation (4G), and fifth-generation (5G) cellular communication protocols, wireless local area network communication protocols such as Institute of Electrical and Electronics Engineers (IEEE)802.11, and/or any other protocol now known or later developed. Moreover, the communication may utilize any suitable wireless communication technique including, but not limited to, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Frequency Division Duplex (FDD), Time Division Duplex (TDD), Multiple Input Multiple Output (MIMO), orthogonal frequency division multiple access (OFDM), and/or any other technique now known or later developed.
According to embodiments of the present disclosure, the network device 130 may determine a candidate configuration of an uplink subframe for transmitting the preamble under a plurality of predetermined conditions, wherein the predetermined conditions relate to uplink or downlink transmission conditions. As an example, the uplink or downlink transmission conditions may cover substantially all actual transmission scenarios of the data flow sensed by the first terminal device 110 or the second terminal device 120, e.g. uplink and downlink subframe configurations. The network device may then send an indication of the configuration to the first terminal device 110 or the second terminal device 120, so that the respective terminal device may configure the uplink subframe for transmitting the preamble according to the indication.
For a single terminal device (e.g., first terminal device 110), it may sense the actual transmission condition of the data stream and select a predetermined subframe corresponding to the actual transmission condition for transmitting the preamble according to the received indication from the network device side. In other words, the network device 130 defines in advance candidate configurations required for encountering various transmission situations, and then the first terminal device 110 senses an actual transmission situation, for example, and flexibly configures the random access channel resource for transmitting the preamble in a candidate configuration manner defined in advance by the network device 130, so as to avoid a delay of a random access procedure and further improve a success rate of PRACH transmission.
Fig. 2 illustrates a high-level piping diagram of signaling interactions by the network device 130 with one of the terminal devices 110 for PRACH transmission, in accordance with certain embodiments of the present disclosure. As shown in fig. 2, prior to uplink preamble transmission, the network device 130 determines (210) candidate configurations of the UL subframe under a plurality of conditions and sends (220) these candidate configurations and an indication of the respective conditions to a terminal device, e.g. the first terminal device 110. The first terminal device 110 may determine (230) a currently fulfilled condition and the received indication selects (240) the one or ones of the plurality of candidate configurations corresponding to the fulfilled condition. The first terminal device 110 then sets the UL subframe according to the candidate configuration for transmitting (250) the preamble to the network device 130.
The principles and specific embodiments of the present disclosure will be described in detail below with reference to fig. 3-6 from the perspective of the network device 130 and the first terminal device 110, respectively. Referring first to fig. 3, a flow diagram of an example communication method 300 is shown, in accordance with certain embodiments of the present disclosure. It is to be appreciated that the method 300 may be implemented, for example, at the network device 130 as shown in fig. 1 and 2. For ease of description, the method 300 is described below in conjunction with fig. 1 and 2.
As shown, at 305, the network device 130 determines a candidate configuration of an uplink subframe for transmitting the preamble under a plurality of predetermined conditions, the predetermined conditions relating to uplink or downlink transmission conditions and to uplink and downlink subframe configurations. At 310, the network device 130 sends an indication of the configuration to the first terminal device 110, such that the terminal device configures the uplink subframe according to the indication.
In this way, the network device 130 may send an indication to the first terminal device 110 on how to configure the uplink subframe according to the uplink or downlink transmission condition, so that the first terminal device 110 receiving the indication adopts a corresponding strategy to transmit the preamble on the allocated carrier, thereby avoiding the delay of the random access procedure as described above, improving the success rate of PRACH transmission, and reasonably allocating channel resources for random access. The processing at the terminal side will be described in detail later in conjunction with fig. 6.
In some embodiments, network device 130 may determine the following first candidate configuration: if there is a predetermined subframe, an uplink subframe for carrying a preamble is located after the predetermined subframe. In some implementations, the predetermined subframe is, for example, a downlink end subframe. Figure 4 shows a schematic diagram of one such embodiment. In data frame 400, data frames 410, 420, and 430 with the letter "D" represent downlink subframes, where "D" with a colored undertone overlay represents a downlink end subframe, and subframe 440 may be used to transmit a preamble, respectively. At this time, when a downlink end subframe following a series of downlink subframes is sensed, the terminal device may allocate a next subframe as a subframe for transmitting the preamble. As another example, when a downlink end subframe following a series of downlink subframes is sensed, the terminal device may allocate an nth subframe following the downlink end subframe as a subframe for transmitting the preamble, N being a positive integer. In this way, the terminal device may be enabled to configure the respective subframe for transmitting the preamble by sensing downlink end subframe signalling, thereby avoiding or reducing the delay for the random access procedure.
In some embodiments, the network device 130 may also determine a second candidate configuration as follows: if the preamble format is 4, the uplink subframe for carrying the preamble is located in the special subframe. Figure 5 shows a schematic diagram of one such embodiment. In the data frame 500, a subframe with the letter "D" represents a downlink subframe, a data frame with "U" is an uplink subframe, and a subframe 510 with the letter "S" is a special subframe (special subframe). The special subframe 510 may be used for a subframe in which a preamble is transmitted. Accordingly, the terminal device may decode the data frame and sense the special sub-frame 510 in the frame. As an example, when a special subframe 510 is sensed, the terminal device may allocate the special subframe as a subframe for transmitting a preamble. In this way, the terminal device may be enabled to configure it for transmission of the preamble by sensing the special subframe, thereby avoiding or reducing the delay for the random access procedure.
In some embodiments, the network device 130 may determine the following third candidate configuration: in case the terminal device learns one or more predetermined uplink subframes in the data frame, then the uplink subframe for carrying the preamble is located in one or more of the learned predetermined uplink subframes. In other words, the third candidate configuration provides for pre-configuring a portion of the subframes as potential random access channel resources for transmitting the preamble. As an example, odd subframes in a data frame are configured as subframes for transmitting a preamble. Generally, the predetermined uplink subframe is a predetermined uplink subframe counted from a boundary of a data frame. In this way, the terminal device may be enabled to use the subframes known in advance as potential random access channel resources for transmitting the preamble, thereby avoiding or reducing the delay for the random access procedure.
In some embodiments, the random access procedure is also delayed if the network device does not transmit the PDCCH for a long period of time. Thus, the network device 130 may also determine the following fourth candidate configuration: if the downlink is in a silent state, the uplink subframe for carrying the preamble is located after a Stand-alone Discovery Signal (Stand-alone Discovery Signal). Accordingly, the terminal device decodes the data frame and senses the independent discovery signal in the frame. As an example, when sensing the independent discovery signal, the terminal device may allocate a next subframe as a subframe for transmitting the preamble. As another example, when sensing the independent discovery signal, the terminal device may allocate an mth subframe after the independent discovery signal as a subframe for transmitting the preamble, M being a positive integer. In this way, the terminal device may be enabled to configure respective subframes for transmitting the preamble by sensing the independent discovery signals, thereby avoiding or reducing the delay for the random access procedure.
In some embodiments, if the density of independent discovery signals expected to be received while the downlink is in the silence state is insufficient, the random access procedure may still be delayed. Thus, the network device 130 may determine the following fifth candidate configuration: it is determined that the uplink subframe is located after a predetermined number of consecutive null subframes if the terminal device detects the predetermined number of consecutive null subframes from one or more data frames. Accordingly, the terminal device can regard the next subframe as a subframe for transmitting the preamble after detecting no downlink transmission for a plurality of consecutive subframes in the data frame. As an example, when 9 consecutive null subframes are sensed in one data frame, the terminal device may allocate the next subframe as the subframe for transmitting the preamble. As another example, when, for example, 9 null subframes are sensed, the terminal device may allocate a following Q-th subframe as a subframe for transmitting the preamble, Q being a positive integer. In this way, the terminal device may be enabled to configure a corresponding subframe for transmitting the preamble by sensing a predetermined number of empty subframes and treating the following subframes as PRACH resources, thereby avoiding or reducing a delay for the random access procedure.
It should be appreciated that for the success rate of PRACH transmission to complete random access as soon as possible, the density of subframes used for transmitting preambles may be increased in the data frame. Therefore, a plurality of subframes for transmitting the preamble can be configured in each actual transmission case. In addition, Radio Resource Control (RRC) layer signaling may be created on the network device side, and the subframe for transmitting the preamble may be configured to be located after the RRC layer signaling.
Table 1 below covers several examples of the first, second, third, fourth and fifth candidate configurations described above. For example, the subframe number corresponding to the PRACH resource index 1 covers the first candidate configuration, the fourth candidate configuration, and the fifth candidate configuration. The subframe number corresponding to the PRACH resource index 6 covers the third candidate configuration, the fourth candidate configuration, and the fifth candidate configuration. The subframe number corresponding to the PRACH resource index 9 covers the second candidate configuration, the fourth candidate configuration, and the fifth candidate configuration.
TABLE 1
It should be understood that these configurations shown in table 1 and described above are merely exemplary. These examples are described merely to facilitate an understanding of the concepts and principles of the embodiments of the disclosure, and are not intended to limit the scope of the disclosure in any way. Moreover, other aspects of the configurations may be accomplished in any manner now known or later developed, and the scope of the present disclosure is not limited in this respect as such.
In an implementation, the network device 130 may organize and transmit the candidate configurations and their corresponding conditions to the terminal devices 110, 120 in any suitable manner, such as tables, program code, scripts, text files, and so forth. The scope of the disclosure is not limited in this respect.
In addition, since the present disclosure provides a new PRICH resource configuration, the conventional PRACH mask index also needs to be modified to adapt to the new PRICH resource configuration. The PRACH mask may be used to trigger PRACH transmissions on a particular resource selected from alternative PRACH resources. With respect to the time domain aspect, the PRACH mask should cover all possible time domain PRACH resources in one data frame of the eLAA. With respect to the frequency domain aspect, the PRACH mask should support a maximum PRACH doubling capability (e.g., 3 times) in one subframe.
Table 2 below shows the improved PRACH mask index. With the PRACH mask index reconfigured in table 2, configuration collisions can be avoided.
TABLE 2
Fig. 6 illustrates a flow diagram of an example communication method 600 in accordance with certain embodiments of the present disclosure. It is to be appreciated that method 600 may be implemented, for example, at first terminal device 110 as shown in fig. 1 and 2. For ease of description, the method 600 is described below in conjunction with fig. 1 and 2.
As shown, at 605, the first terminal device 110 receives from the network device 130 an indication of a candidate configuration of an uplink subframe for transmission of a preamble under a plurality of predetermined conditions. At 610, the first terminal device 110 determines a condition of a plurality of predetermined conditions to be met based on uplink or downlink transmission conditions at the terminal device. As described above, the conditions corresponding to different candidate configurations are determined based on uplink and/or downlink conditions. Thus, the first terminal device 110 may determine which one or more of these conditions has been met by sensing the current uplink and/or downlink conditions
At 615, the first terminal device 110 selects a candidate configuration from the candidate configurations based on the candidate configurations corresponding to the indication and the satisfied condition, so as to set an uplink subframe for transmitting the preamble. For example, in some embodiments, the first terminal device 110 may select the first candidate configuration in which the uplink subframe for carrying the preamble is set after the predetermined subframe in the presence of the predetermined subframe. As an example, the first terminal device 110 may transmit the preamble on the first subframe after the downlink end subframe. In this way, the terminal device may be enabled to configure the respective subframe for transmitting the preamble by sensing downlink end subframe signalling, thereby avoiding or reducing the delay for the random access procedure.
In some embodiments, the first terminal device 110 may select the second candidate configuration for setting the uplink subframe for carrying the preamble in the special subframe in response to the format of the preamble being 4. As an example, when a special subframe is sensed, the terminal device may allocate the special subframe as a subframe for transmitting the preamble. In this way, the terminal device may be enabled to configure it for transmission of the preamble by sensing the special subframe, thereby avoiding or reducing the delay for the random access procedure.
In some embodiments, first terminal device 110 may select a third candidate configuration that sets an uplink subframe for transmitting a preamble in one or more of the learned predetermined uplink subframes in response to learning one or more predetermined uplink subframes in the data frame. As an example, odd subframes in a data frame are configured as subframes for transmitting a preamble. In this way, the terminal device may be enabled to use the subframes known in advance as potential random access channel resources for transmitting the preamble, thereby avoiding or reducing the delay for the random access procedure.
In some embodiments, the first terminal device 110 may select a fourth candidate configuration in which the uplink subframe for carrying the preamble is arranged after the independent discovery signal in response to the downlink being in the silent state. As an example, when sensing the independent discovery signal, the terminal device may allocate a next subframe as a subframe for transmitting the preamble. In this way, the terminal device may be enabled to configure respective subframes for transmitting the preamble by sensing the independent discovery signals, thereby avoiding or reducing the delay for the random access procedure.
In some embodiments, the first terminal device 110 may select the fifth candidate configuration in which the uplink subframe for transmitting the preamble is arranged after a predetermined number of consecutive empty subframes in response to detecting the predetermined number of consecutive empty subframes from the data frame. As an example, when e.g. 9 consecutive empty subframes are sensed, the terminal device may allocate the next subframe as the subframe for transmitting the preamble. In this way, the terminal device may be enabled to configure a corresponding subframe for transmitting the preamble by sensing a predetermined number of empty subframes and treating the following subframes as PRACH resources, thereby avoiding or reducing a delay for the random access procedure.
It should be understood that the operations and related features performed by the network device 130 described above in conjunction with the schematic diagrams of fig. 3 to fig. 5 are also applicable to the method 600 performed by the first terminal device 110, and have the same effects, and detailed details are not described again.
Fig. 7 illustrates a block diagram of an apparatus 700 according to certain embodiments of the present disclosure. It is to be appreciated that the apparatus 700 may be implemented on the network device 130 side shown in fig. 1 and 2. As shown in fig. 7, the apparatus 700 includes: a determining unit 705 configured to determine candidate configurations of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions; a transmitting unit 710 configured to transmit an indication of the configuration to the terminal device, so that the terminal device configures the uplink subframe according to the indication.
In some embodiments, the determining unit 705 comprises a first determining unit configured to determine a first candidate configuration for an uplink subframe carrying a preamble after a predetermined subframe. In some embodiments, the predetermined subframe is a downlink end subframe.
In some embodiments, the determining unit 705 comprises a second determining unit configured to determine a second candidate configuration for an uplink subframe carrying a preamble to be located in a special subframe if the format of the preamble is 4.
In some embodiments, the determining unit 705 comprises a third determining unit configured to determine a third candidate configuration in which the uplink subframe for transmitting the preamble is located in one or more of the learned predetermined uplink subframes if the terminal device learns the one or more predetermined uplink subframes in the data frame.
In some embodiments, the determining unit 705 comprises a fourth determining unit configured to determine a fourth candidate configuration for an uplink subframe carrying a preamble located after the independent discovery signal if the downlink is in the silent state.
In some embodiments, the determining unit 705 comprises a fifth determining unit configured to determine a fifth candidate configuration in which the uplink subframe is located after a predetermined number of consecutive empty subframes if the terminal device detects the predetermined number of consecutive empty subframes from the data frame.
Fig. 8 illustrates a block diagram of an apparatus 800 according to certain embodiments of the present disclosure. It is understood that the apparatus 800 may be implemented on the side of the first terminal device 110 shown in fig. 1 and 2. As shown, the apparatus 800 includes: a receiving unit 805 configured to receive, from a network device, an indication of a candidate configuration of an uplink subframe for transmission of a preamble under a plurality of predetermined conditions; a determining unit 810 configured to determine a condition that is satisfied from among a plurality of predetermined conditions based on an uplink or downlink transmission condition at the terminal device; and a selecting unit 815 configured to select a candidate configuration from the candidate configurations based on the candidate configurations corresponding to the indication and the satisfied condition so as to set an uplink subframe for transmitting the preamble.
In some embodiments, the selecting unit 815 comprises a first selecting unit configured to select a first candidate configuration in which an uplink subframe for carrying a preamble is disposed after a predetermined subframe. In some embodiments, the predetermined subframe is a downlink end subframe.
In some embodiments, the selecting unit 815 includes a second selecting unit configured to select a second candidate configuration for setting the uplink subframe for carrying the preamble in the special subframe in response to the preamble having a format of 4.
In some embodiments, the selecting unit 815 includes a third selecting unit configured to select a third candidate configuration that sets the uplink subframe for transmitting the preamble in one or more of the learned predetermined uplink subframes in response to learning of the one or more predetermined uplink subframes in the data frame.
In some embodiments, the selecting unit 815 includes a fourth selecting unit configured to select a fourth candidate configuration in which an uplink subframe for carrying a preamble is disposed after the independent discovery signal in response to the downlink being in the silent state.
In some embodiments, the selecting unit 815 includes a fifth selecting unit configured to select a fifth candidate configuration in which the uplink subframe for transmitting the preamble is disposed after a predetermined number of consecutive null subframes in response to detecting the predetermined number of consecutive null subframes from the data frame.
It should be understood that each unit recited in the apparatus 700 and the apparatus 800 corresponds to each step in the methods 300 and 600 described with reference to fig. 1-6, respectively. Therefore, the operations and features described above in connection with fig. 1 to 6 are equally applicable to the apparatus 700 and the apparatus 800 and the units included therein, and have the same effects, and detailed details are not repeated.
The units included in the apparatus 700 and the apparatus 800 may be implemented in various ways, including software, hardware, firmware, or any combination thereof. In one embodiment, one or more of the units may be implemented using software and/or firmware, such as machine executable instructions stored on a storage medium. In addition to, or in the alternative to, machine-executable instructions, some or all of the elements in apparatus 700 and apparatus 800 may be implemented, at least in part, by one or more hardware logic components. By way of example, and not limitation, exemplary types of hardware logic components that may be used include Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standards (ASSPs), systems on a chip (SOCs), Complex Programmable Logic Devices (CPLDs), and so forth.
Fig. 9 illustrates a block diagram of a device 900 suitable for implementing embodiments of the present disclosure. Device 900 may be used to implement a network device, such as network device 130 shown in fig. 1 and 2; and/or to implement a terminal device, such as the first terminal device 110 shown in fig. 1 and 2.
As shown, the device 900 includes a controller 910. The controller 910 controls the operation and functions of the device 900. For example, in certain embodiments, the controller 910 may perform various operations by way of instructions 930 stored in a memory 920 coupled thereto. The memory 920 may be of any suitable type suitable to the local technical environment and may be implemented using any suitable data storage technology, including but not limited to semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems. Although only a single memory unit is illustrated in FIG. 9, there may be multiple physically distinct memory units within device 900.
The controller 910 may be of any suitable type suitable to the local technical environment, and may include, but is not limited to, one or more of general purpose computers, special purpose computers, microcontrollers, digital signal controllers (DSPs), and controller-based multi-core controller architectures. The device 900 may also include a plurality of controllers 910. The controller 910 is coupled to a transceiver 940, and the transceiver 940 may enable receiving and transmitting information via one or more antennas 950 and/or other components.
When the device 900 is acting as the network device 130, the controller 910 and the transceiver 940 may operate in cooperation to implement the method 300 described above with reference to fig. 3. When the device 900 is acting as the first terminal device 110, the controller 910 and the transceiver 940 may operate in cooperation to implement the method 600 described above with reference to fig. 6. For example, in certain embodiments, all acts described above relating to data/information transceiving may be performed by the transceiver 940, while other acts may be performed by the controller 910. All of the features described above with reference to fig. 3 and 6 apply to the device 900 and are not described in detail herein.
In general, the various example embodiments of this disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Certain aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While aspects of embodiments of the disclosure have been illustrated or described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
By way of example, implementations of the disclosure may be described in the context of machine-executable instructions, such as program modules, being included in a device executing on a target real or virtual processor. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or divided between program modules as described. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed facility, program modules may be located in both local and remote memory storage media.
Computer program code for implementing the methods of the present disclosure may be written in one or more programming languages. These computer program codes may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the computer or other programmable data processing apparatus, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.
In the context of this disclosure, a machine-readable medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of a machine-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical storage device, a magnetic storage device, or any suitable combination thereof.
Additionally, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking or parallel processing may be beneficial. Likewise, while the above discussion contains certain specific implementation details, this should not be construed as limiting the scope of any invention or claims, but rather as describing particular embodiments that may be directed to particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (28)
1. A method of communication, comprising:
determining, at a network device, a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions, the predetermined conditions relating to uplink or downlink transmission conditions; and
sending the configured indication to a terminal device so that the terminal device can execute the following operations:
determining a condition of the plurality of predetermined conditions to be met based on uplink or downlink transmission conditions at the terminal device;
selecting a candidate configuration from the candidate configurations according to the indication and the candidate configuration corresponding to the satisfied condition so as to configure the uplink subframe.
2. The method of claim 1, wherein determining a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions comprises:
determining a first candidate configuration for which the uplink subframe is located after a predetermined subframe.
3. The method of claim 2, wherein the predetermined subframe is a downlink end subframe.
4. The method of claim 1, wherein determining a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions comprises:
determining a second candidate configuration that the uplink subframe is located in a special subframe if the format of the preamble is 4.
5. The method of claim 1, wherein determining a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions comprises:
determining a third candidate configuration in which the uplink subframe is located in the learned one or more predetermined uplink subframes if the terminal device learns the one or more predetermined uplink subframes in the data frame.
6. The method of claim 1, wherein determining a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions comprises:
determining a fourth candidate configuration in which the uplink subframe is located after an independent discovery signal with the downlink in the mute state.
7. The method of claim 1, wherein determining a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions comprises:
determining a fifth candidate configuration in which the uplink subframe is located after a predetermined number of consecutive null subframes if the terminal device detects the predetermined number of consecutive null subframes from a data frame.
8. A method of communication, comprising:
receiving, at a terminal device, an indication of a candidate configuration of an uplink subframe for transmission of a preamble under a plurality of predetermined conditions from a network device;
determining a condition of the plurality of predetermined conditions to be met based on uplink or downlink transmission conditions at the terminal device; and
selecting a candidate configuration from the candidate configurations based on the candidate configurations corresponding to the indication and the satisfied condition so as to set the uplink subframe for transmitting the preamble.
9. The method of claim 8, wherein selecting a candidate configuration comprises:
selecting a first candidate configuration that places the uplink subframe after a predetermined subframe.
10. The method of claim 9, wherein the predetermined subframe is a downlink end subframe.
11. The method of claim 8, wherein selecting a candidate configuration comprises:
selecting a second candidate configuration to place the uplink subframe in a special subframe in response to the preamble having a format of 4.
12. The method of claim 8, wherein selecting a candidate configuration comprises:
in response to learning one or more predetermined uplink subframes in the data frame, selecting a third candidate configuration that places the uplink subframes in the learned one or more predetermined uplink subframes.
13. The method of claim 8, wherein selecting a candidate configuration comprises:
selecting a fourth candidate configuration that places the uplink subframe after an independent discovery signal in response to the downlink being in a mute state.
14. The method of claim 8, wherein selecting a candidate configuration comprises:
in response to detecting a predetermined number of consecutive empty subframes from a data frame, selecting a fifth candidate configuration that places the uplink subframe after the predetermined number of consecutive empty subframes.
15. A network device, comprising:
a controller configured to determine a candidate configuration of an uplink subframe for transmitting a preamble under a plurality of predetermined conditions, the predetermined conditions relating to uplink or downlink transmission conditions; and
a transceiver configured to transmit an indication of the configuration to a terminal device for the terminal device to:
determining a condition of the plurality of predetermined conditions to be met based on uplink or downlink transmission conditions at the terminal device;
selecting a candidate configuration from the candidate configurations according to the indication and the candidate configuration corresponding to the satisfied condition so as to configure the uplink subframe.
16. The network device of claim 15, wherein the controller is configured to:
determining a first candidate configuration for which the uplink subframe is located after a predetermined subframe.
17. The network device of claim 16, wherein the predetermined subframe is a downlink end subframe.
18. The network device of claim 15, wherein the controller is configured to:
determining a second candidate configuration that the uplink subframe is located in a special subframe if the format of the preamble is 4.
19. The network device of claim 15, wherein the controller is configured to:
determining a third candidate configuration in which the uplink subframe is located in the learned one or more predetermined uplink subframes if the terminal device learns the one or more predetermined uplink subframes in the data frame.
20. The network device of claim 15, wherein the controller is configured to:
determining a fourth candidate configuration in which the uplink subframe is located after an independent discovery signal with the downlink in the mute state.
21. The network device of claim 15, wherein the controller is configured to:
determining a fifth candidate configuration in which the uplink subframe is located after a predetermined number of consecutive null subframes if the terminal device detects the predetermined number of consecutive null subframes from a data frame.
22. A terminal device, comprising:
a transceiver configured to receive, from a network device, an indication of a candidate configuration of an uplink subframe for transmission of a preamble under a plurality of predetermined conditions; and
a controller configured to determine a satisfied condition of the plurality of predetermined conditions based on uplink or downlink transmission conditions at the terminal device, and to select a candidate configuration from the candidate configurations based on a candidate configuration corresponding to the indication and the satisfied condition in order to set the uplink subframe for transmitting a preamble.
23. The terminal device of claim 22, wherein the controller is configured to:
selecting a first candidate configuration that places the uplink subframe after a predetermined subframe.
24. The terminal device of claim 23, wherein the predetermined subframe is a downlink end subframe.
25. The terminal device of claim 22, wherein the controller is configured to:
selecting a second candidate configuration to place the uplink subframe in a special subframe in response to the preamble having a format of 4.
26. The terminal device of claim 22, wherein the controller is configured to:
in response to learning one or more predetermined uplink subframes in the data frame, selecting a third candidate configuration that places the uplink subframes in the learned one or more predetermined uplink subframes.
27. The terminal device of claim 22, wherein the controller is configured to:
selecting a fourth candidate configuration that places the uplink subframe after an independent discovery signal in response to the downlink being in a mute state.
28. The terminal device of claim 22, wherein the controller is configured to:
in response to detecting a predetermined number of consecutive empty subframes from a data frame, selecting a fifth candidate configuration that places the uplink subframe after the predetermined number of consecutive empty subframes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610801556.XA CN107800523B (en) | 2016-09-02 | 2016-09-02 | Method and apparatus for configuring random access channel resources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610801556.XA CN107800523B (en) | 2016-09-02 | 2016-09-02 | Method and apparatus for configuring random access channel resources |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107800523A CN107800523A (en) | 2018-03-13 |
| CN107800523B true CN107800523B (en) | 2021-03-19 |
Family
ID=61530561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610801556.XA Active CN107800523B (en) | 2016-09-02 | 2016-09-02 | Method and apparatus for configuring random access channel resources |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107800523B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11490428B2 (en) * | 2018-04-06 | 2022-11-01 | Mediatek Inc. | Initial access in new radio unlicensed spectrum |
| CN110621081B (en) * | 2018-06-19 | 2021-03-23 | 维沃移动通信有限公司 | Random access method and terminal equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101562896A (en) * | 2008-04-16 | 2009-10-21 | 中兴通讯股份有限公司 | Stochastic access method based on reinforced-special transmission channel |
| CN102138360A (en) * | 2008-07-01 | 2011-07-27 | 爱立信电话股份有限公司 | Methods and apparatuses for performing preamble assignment for random access in a telecommunications system |
| CN102783238A (en) * | 2010-04-06 | 2012-11-14 | 上海贝尔股份有限公司 | Random access method for radio relay communication system and base station thereof |
| WO2016085287A1 (en) * | 2014-11-27 | 2016-06-02 | 엘지전자 주식회사 | Random access method and apparatus therefor |
| CN105704834A (en) * | 2016-04-01 | 2016-06-22 | 宇龙计算机通信科技(深圳)有限公司 | Configuration method and sending method for lead code on non-authorized carrier and related equipment |
| CN105848165A (en) * | 2015-01-14 | 2016-08-10 | 中兴通讯股份有限公司 | Unauthorized resource use methods and system, base station, and user equipment |
| CN105898883A (en) * | 2016-04-01 | 2016-08-24 | 宇龙计算机通信科技(深圳)有限公司 | Preamble configuring method, preamble sending method and related equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9100941B2 (en) * | 2012-05-24 | 2015-08-04 | Nokia Solutions And Networks Oy | Using unique preambles for D2D communications in LTE |
-
2016
- 2016-09-02 CN CN201610801556.XA patent/CN107800523B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101562896A (en) * | 2008-04-16 | 2009-10-21 | 中兴通讯股份有限公司 | Stochastic access method based on reinforced-special transmission channel |
| CN102138360A (en) * | 2008-07-01 | 2011-07-27 | 爱立信电话股份有限公司 | Methods and apparatuses for performing preamble assignment for random access in a telecommunications system |
| CN103957604A (en) * | 2008-07-01 | 2014-07-30 | 爱立信电话股份有限公司 | Methods and apparatuses for performing preamble assignment for random access in a telecommunications system |
| CN102783238A (en) * | 2010-04-06 | 2012-11-14 | 上海贝尔股份有限公司 | Random access method for radio relay communication system and base station thereof |
| WO2016085287A1 (en) * | 2014-11-27 | 2016-06-02 | 엘지전자 주식회사 | Random access method and apparatus therefor |
| CN105848165A (en) * | 2015-01-14 | 2016-08-10 | 中兴通讯股份有限公司 | Unauthorized resource use methods and system, base station, and user equipment |
| CN105704834A (en) * | 2016-04-01 | 2016-06-22 | 宇龙计算机通信科技(深圳)有限公司 | Configuration method and sending method for lead code on non-authorized carrier and related equipment |
| CN105898883A (en) * | 2016-04-01 | 2016-08-24 | 宇龙计算机通信科技(深圳)有限公司 | Preamble configuring method, preamble sending method and related equipment |
Non-Patent Citations (2)
| Title |
|---|
| PRACH Design for LAA;ZTE Microelectronics Technology等;《3GPP TSG RAN WG1 Meeting #84bis》;20160415;全文 * |
| PRACH Design for LAA;ZTE;《3GPP TSG RAN WG1 Meeting #85》;20160517;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107800523A (en) | 2018-03-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106470468B (en) | Transmission method and device for random access response | |
| US11197320B2 (en) | Uplink transmission resource scheduling method and device, and uplink transmission method and device | |
| CN104955144B (en) | Uplink transmission power control method and user equipment | |
| KR102032884B1 (en) | Method and apparatus for transmitting physical downlink control channel | |
| CN109075893B (en) | Base station, user equipment and wireless communication method | |
| US10863552B2 (en) | User equipment, eNode B and wireless communication method | |
| EP3198973B1 (en) | Repeated transmission of scheduling assignment for random access response | |
| CN110972275B (en) | Indication information transmission method and device | |
| US11412546B2 (en) | Wireless communications system, communications apparatus, and processing method | |
| CN105306180A (en) | LAA (License Assisted Access) communication method and device | |
| CN108243497B (en) | Method for autonomous uplink signal transmission, and corresponding terminal device and network device | |
| CN112106414A (en) | Paging occasion start determination | |
| CN109842939B (en) | Uplink transmission method, apparatus, and computer-readable medium | |
| KR20200076736A (en) | Method, apparatus, computer-readable storage and carrier for random access | |
| CN107800523B (en) | Method and apparatus for configuring random access channel resources | |
| CN108432326A (en) | Time discontinuous transmission for narrowband Internet of Things | |
| CN108667578B (en) | Communication method and communication device | |
| CN107708211B (en) | Communication method for multi-user superposition transmission and corresponding network equipment and terminal equipment | |
| CN112088507A (en) | Information transmission method, communication equipment and network equipment | |
| CN113973395A (en) | Random access method, configuration method and related equipment | |
| CN107733599B (en) | Method and apparatus for demodulation reference signal enhancement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |