Method and system for data transmission in a wireless network

Abstract

Methods, apparatus, and systems for improving data transmission efficiency in wireless networks are described. In one example aspect, a wireless communication method includes: receiving multiple preambles and multiple corresponding media access control random access responses through multiple cells, multiplexing the multiple corresponding media access control random access responses into one media access control protocol data unit when it is determined that the multiple preambles are received in the same random access channel resource, adding an indication that the media access control protocol data unit includes the multiple media access control random access responses to a media access control subheader when it is determined that the multiple corresponding media access control random access responses are in different single frequency networks, and transmitting the media access control protocol data unit including the media access control subheader with the indication.

Description

Technical Field

[0001] The present application relates generally to wireless communications. Background Art

[0002] Mobile communication technology is driving the world towards an increasingly connected and networked society. The rapid growth of mobile communications and technological advances have led to greater demands for capacity and connectivity. Other aspects, such as energy consumption, equipment cost, spectrum efficiency, and latency are also important to meet the needs of various communication scenarios. Various technologies are being discussed, including new ways to provide higher quality of service, longer battery life, and improved performance. Summary of the invention

[0003] Among other things, this patent application describes techniques for reducing or minimizing collisions in wireless networks.

[0004] In an example embodiment of the disclosed technology, a wireless communication method is disclosed. The wireless communication method includes: receiving multiple preambles and multiple corresponding media access control random access responses through multiple cells, multiplexing the multiple corresponding media access control random access responses into one media access control protocol data unit when it is determined that the multiple corresponding media access control random access responses are received in the same random access channel resource, adding an indication that a media access control protocol data unit includes multiple media access control random access responses to a media access control subheader when it is determined that the multiple corresponding media access control random access responses are in different single frequency networks, and transmitting a media access control protocol data unit including a media access control subheader with the indication.

[0005] In another example embodiment of the disclosed technology, a wireless communication method is disclosed. The wireless communication method includes: receiving multiple preambles and multiple corresponding media access control random access responses through multiple cells, multiplexing the multiple corresponding media access control random access responses into one media access control protocol data unit when it is determined that the multiple corresponding media access control random access responses are received in the same random access channel resource, adding one media access control protocol data unit including an indication of the multiple media access control random access responses to a backoff indicator subheader when it is determined that the multiple corresponding media access control random access responses are in different single frequency networks, and transmitting the media access control protocol data unit including the backoff indicator subheader with the indication.

[0006] In another example embodiment of the disclosed technology, a wireless communication method is disclosed. The wireless communication method includes: receiving multiple preambles and multiple corresponding media access control random access responses through multiple cells, and when determining that multiple preambles are received in the same random access channel resource, multiplexing the multiple corresponding media access control random access responses into one media access control protocol data unit, and transmitting the media access control protocol data unit. Each of the multiple media access control random access responses includes an indication of distinguishing a portion of the media access control protocol data unit received through the authorized cell from another portion of the media access control protocol data unit received through the unlicensed cell.

[0007] Some embodiments may preferably implement these methods as follows:

[0008] The above method, wherein different single frequency networks have the same random access response.

[0009] The above method, wherein when multiple preambles and multiple corresponding medium access control random access responses are received through the unlicensed cell, the indication includes a single frequency network preamble.

[0010] The above method, wherein the multiple cells include authorized cells and unlicensed cells, and wherein the method further comprises adding an additional indication to the media access control subheader to distinguish the authorized cells from the unlicensed cells.

[0011] The above method, wherein the medium access control subheader in the authorized cell has a random access preamble identifier field format different from that of the medium access control subheader in the unlicensed cell.

[0012] The above method, wherein the media access control subheader in the authorized cell and the unauthorized cell has a common field configured to have the same value.

[0013] The method above, wherein the common field has a first value indicating that the medium access control subheader includes a random access preamble identifier field.

[0014] The above method, wherein the common field has a second value indicating that the medium access control subheader includes a random access preamble identifier field and a single frequency network identifier.

[0015] The above method, wherein different single frequency networks have the same random access response.

[0016] The above method, wherein when multiple preambles and multiple corresponding medium access control random access responses are received through the unlicensed cell, the indication includes a single frequency network preamble.

[0017] The above method, wherein the medium access control subheader in the authorized cell has a backoff indicator field format different from that of the medium access control subheader in the unauthorized cell.

[0018] The above method, wherein the medium access control subheader in the unlicensed cell has a field indicating whether a certain medium access control random access response is from a new radio cell.

[0019] The above method, wherein the medium access control random access responses in the authorized cell and the unauthorized cell have a common field configured to have the same value.

[0020] The above method, wherein the common field has a first value indicating the use of a medium access control random access response in a granted cell.

[0021] The above method, wherein the multiple cells include authorized cells and unlicensed cells, and wherein the method further includes generating a separate medium access control protocol data unit to distinguish between a medium access control random access response received through the authorized cell and a medium access control random access response received through the unlicensed cell.

[0022] The above method, wherein the media access control protocol data unit received through the unlicensed cell includes a single frequency network identifier subheader.

[0023] The above method, wherein the medium access control random access response in the licensed cell and the unlicensed cell has a common field configured to indicate a backoff indicator subheader or a single frequency network.

[0024] In yet another exemplary embodiment of the disclosed technology, the above method is embodied in the form of processor executable code and stored in a computer readable program medium.

[0025] In yet another example embodiment of the disclosed technology, a device configured or operable to perform the above method is disclosed.

[0026] The above-described aspects and other aspects and embodiments thereof are described in more detail in the drawings, the description and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An example of a wireless communication system is shown.

[0028] Figure 2 An example configuration of a medium access control (MAC) subheader having a random access preamble ID (RAPID) format in a granted cell based on some embodiments of the disclosed technology is shown.

[0029] Figure 3An example configuration of a MAC subheader having a RAPID format in an unlicensed cell based on some embodiments of the disclosed technology is shown.

[0030] Figure 4 An example configuration of a MAC subheader having a RAPID format in an unlicensed cell based on some embodiments of the disclosed technology is shown.

[0031] Figure 5 An example configuration of a backoff indicator (BI) subheader for an unlicensed cell based on some embodiments of the disclosed technology is shown.

[0032] Figure 6 An example configuration of a sub-header with a RAPID and a single frequency network ID (SFNID) based on some embodiments of the disclosed technology is shown.

[0033] Figure 7 An example configuration of a random access response (RAR) format for a granted cell based on some embodiments of the disclosed technology is shown.

[0034] Figure 8 An example configuration of a RAR format for an unlicensed cell based on some embodiments of the disclosed technology is shown.

[0035] Fig. 9 Another example configuration of a RAR format for an unlicensed cell based on some embodiments of the disclosed technology is shown.

[0036] Fig.10 Example configurations of BI subheaders and SFN subheaders based on some embodiments of the disclosed technology are shown.

[0037] Fig.11 An example of a medium access control protocol data unit (MAC PDU) including a SFN ID based on some embodiments of the disclosed technology is shown.

[0038] Fig.12 Example configurations of BI subheaders and SFN subheaders for unlicensed cells based on some embodiments of the disclosed technology are shown.

[0039] Fig.13 is a flow chart illustrating an example of a wireless communication method based on some embodiments of the disclosed technology.

[0040] Fig.14 is a flow chart illustrating another example of a wireless communication method based on some embodiments of the disclosed technology.

[0041] Fig.15 is a flow chart illustrating another example of a wireless communication method based on some embodiments of the disclosed technology.

[0042] Fig.16 is a block diagram representation of a portion of a radio station in accordance with one or more embodiments to which the present technology may be applied. DETAILED DESCRIPTION

[0043] Recent wireless communication standards allow transmission in unlicensed spectrum using a listen-before-talk (LBT) process that performs a clear channel assessment (CCA) check before transmission. Among other things, CCA utilizes energy detection techniques to determine whether other signals are present on the channel, thereby determining whether the channel is occupied or idle. If the channel is occupied, the network node enters a backoff state. In this state, a backoff timer is started, and the node waits until the backoff timer expires before performing another LBT process. The backoff timer is decremented at each unoccupied time slot on the medium. If the channel is idle, the node can transmit the message. The transmission duration, which can be represented by the channel occupation time (COT), is limited and governed by the backoff parameters used to access the channel.

[0044] When a user equipment (UE) transmits a first message such as a random access channel (RACH) preamble, it will start a time window (e.g., ra-ResponseWindow configured in RACH-ConfigCommon) at the first physical downlink control channel (PDCCH) opportunity from the end of the RACH preamble transmission. Here, the PDCCH opportunity indicates a duration (i.e., one or more consecutive symbols) during which the media access control (MAC) entity is configured to monitor the PDCCH. However, the second message (e.g., Msg2) transmission may suffer from LBT failure, so that the time window (e.g., ra-ResponseWindow) may expire and the random access response (RAR) reception fails. One possible solution is to extend the RAR window or timer. When the RAR window or timer is extended, some overlapping areas may occur, resulting in network conflicts. To solve this problem, the least significant bit (LSB) of the single frequency network (SFN) transmission preamble can be included in the media access control random access response (MAC RAR) or Msg2 or msgB.

[0045] Embodiments of the disclosed technology provide for the design of the MAC RAR format to avoid overlapping regions that may create data collisions with simultaneous transmissions destined for the same device.

[0046] Figure 1An example of a wireless communication system (e.g., LTE, 5G New Radio (NR) cellular network) including a radio access node 120 and one or more user equipment (UE) 111, 112, and 113 is shown. In some embodiments, a downlink transmission (141, 142, 143) includes a control plane message including a processing order for processing multiple user plane functions. This may be followed by an uplink transmission (131, 132, 133) based on the processing order received by the UE. Similarly, the user plane functions may be processed by the UE for the downlink transmission based on the received processing order. The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine-to-machine (M2M) device, a terminal, a mobile device, an Internet of Things (IoT) device, etc.

[0047] This application uses examples from the 3GPP New Radio (NR) network architecture and 5G protocols only to facilitate understanding, and the techniques and embodiments of the present disclosure may be practiced in other wireless systems that use communication protocols different from the 3GPP protocols.

[0048] Some embodiments of the disclosed technology relate to the design of a MAC RAR for unlicensed spectrum when the LSB of the SFN transmission preamble is included in Msg2. In addition, since carrier aggregation for licensed spectrum and unlicensed spectrum is supported, MAC RARs from licensed cells and unlicensed cells can be multiplexed into a media access control (MAC) protocol data unit (PDU). For unlicensed cells, since the format of the MAC PDU is different from the MAC RAR format of the licensed cell, some embodiments of the disclosed technology can be used to include an indication that can distinguish transmissions from licensed cells from transmissions from unlicensed cells. In one embodiment, the indication may be included in a subheader having a random access preamble ID (RAPID) field. In another embodiment, the indication may be included in a subheader having a backoff indicator (BI) field. In yet another embodiment, the indication may be included in a MAC RAR.

[0049] Figure 2 An example configuration of a MAC subheader having a RAPID format in an authorized cell based on some embodiments of the disclosed technology is shown. Figure 3 An example configuration of a MAC subheader having a RAPID format in an unlicensed cell based on some embodiments of the disclosed technology is shown.

[0050] The field "R" indicates a reserved bit. In one example, the field "E" is an extension field, which is a flag indicating whether the MACsubPDU including the MAC subheader is the last MACsubPDU in the MAC PDU. The field "T" is a type field, which is a flag indicating whether the MAC subheader contains a random access preamble ID or a backoff indicator.

[0051] In some embodiments of the disclosed technology, a RAPID subheader is used to include an indication for distinguishing transmissions through licensed cells from transmissions through unlicensed cells.

[0052] For one UE, multiple cells can be configured, for example, an unlicensed cell acts as a PCell and a licensed cell acts as an SCell. According to the current specification, for an SCell, when a preamble is transmitted on the SCell, a corresponding MAC RAR is transmitted on the PCell. In some embodiments of the disclosed technology, when multiple preambles are received in the same random access channel preamble (PRACH) resource, corresponding MAC RARs from different cells (PCell and SCell) can be multiplexed into one MAC PDU transmitted in the PCell.

[0053] In some embodiments of the disclosed technology, for unlicensed cells, if MAC RARs in different single frequency networks (SFNs) with the same random access response (RA-RNTI) are multiplexed into one media access control protocol data unit (MAC PDU), then for a received preamble, the corresponding SFN transmitted preamble is included in a subheader with a RAPID field.

[0054] In a carrier aggregation (CA) scenario of an unlicensed cell and a licensed cell, since MAC RAR is multiplexed into one MAC PDU and subheaders with RAPID from the unlicensed cell and the licensed cell are different, some embodiments based on the disclosed technology include a distinguishing indication.

[0055] like Figure 2 As shown, the subheader with the RAPID of the authorized cell may include a "T" field and a "RAPID" field, as well as an "E" field, a "T" field, and an "R" field. Figure 3 As shown, the subheader with the RAPID of the unlicensed cell may include an "I" field, a "RAPID" field, and an "SFNID" field, as well as an "E" field, a "T" field, and an "R" field. In some embodiments of the disclosed technology, when the "I" field is set to 0, the subheader includes only the RAPID. If the "I" field is set to 1, the subheader includes the LSB of the RAPID and the SFN.

[0056] Figure 4 An example configuration of a MAC subheader having a RAPID format in an unlicensed cell based on some embodiments of the disclosed technology is shown.

[0057] In another embodiment of the disclosed technology, Figure 4 As shown, the subheader with the RAPID of the unlicensed cell may include a "RAPID" field, an "SFNID" field, an "E" field, a "T" field, and an "R" field. In some embodiments of the disclosed technology, in a carrier aggregation (CA) scenario of an unlicensed cell and a licensed cell, separate MAC PDUs are generated for the licensed cell and the unlicensed cell. For the unlicensed cell, the MAC subheader based on some embodiments of the disclosed technology includes the SFNID. In some implementations, the SFN ID may be the LSB of the SFN transmission preamble.

[0058] Figure 5 An example configuration of a BI subheader for an unlicensed cell based on some embodiments of the disclosed technology is shown. Figure 6 An example configuration of a sub-header with RAPID and SFNID based on some embodiments of the disclosed technology is shown.

[0059] In some embodiments of the disclosed technology, the BI subheader is configured to include an indication for distinguishing transmission through a licensed cell from transmission through an unlicensed cell, and MAC RARs in different SFNs are multiplexed into one MAC PDU. In one example, the field "BI" is a backoff indicator field, and the field "BI" is used to identify an overload condition in a cell. In one example, "R1" indicates another reserved field.

[0060] For a UE, multiple cells can be configured, for example, an unlicensed cell acts as a PCell and a licensed cell acts as an SCell. According to the current specification, for an SCell, when a preamble is transmitted on the SCell, a corresponding MAC RAR is transmitted on the PCell. In some embodiments of the disclosed technology, when multiple preambles are received in the same PRACH resource, corresponding MAC RARs from different cells (e.g., PCell and SCell) can be multiplexed into one MAC PDU transmitted in the PCell.

[0061] In some embodiments of the disclosed technology, for unlicensed cells, if MAC RARs in different single frequency networks (SFNs) with the same RA-RNTI are multiplexed into one MAC PDU, then for the receive preamble, the corresponding SFN transmit preamble is included in the subheader with the RAPID field.

[0062] In addition, since the subheader with RAPID from the unlicensed cell is different from the subheader from the authorized cell, the BI subheader based on some embodiments of the disclosed technology includes an indication for distinguishing transmission through the authorized cell from transmission through the unlicensed cell.

[0063] In some implementations, if the MAC RAR is from a New Radio (NR) cell, the "R1" field is set to 0. Otherwise, the "R1" field is set to 1. In this scheme, MAC RARs from licensed cells and unlicensed cells are generated separately. In some implementations, the UE can distinguish cells by R1. Figure 6 Possible formats of SFN ID are shown.

[0064] Figure 7 An example configuration of a RAR format for an authorized cell based on some embodiments of the disclosed technology is shown. Figure 8 An example configuration of a RAR format for an unlicensed cell based on some embodiments of the disclosed technology is shown.

[0065] The field "Timing Advance Command" indicates an index value TA for controlling the amount of timing adjustment that the MAC entity must apply. The field "UL Grant" is an uplink grant field, which indicates the resources to be used on the uplink. The field "Temporary C-RNTI" indicates a temporary identity used by the MAC entity during random access.

[0066] In some embodiments of the disclosed technology, MAC RAR is used to include an indication for distinguishing transmissions through licensed cells from transmissions through unlicensed cells. In addition, MAC RARs in different SFNs are multiplexed into one MAC PDU.

[0067] In some embodiments of the disclosed technology, the size of the MAC RAR may be expanded. Figure 7 and Figure 8 A possible example is shown. In addition, in order to distinguish MAC subPDUs, the first reserved bit can be used to indicate whether the RAR belongs to an authorized cell or an unauthorized cell.

[0068] If the R1 field is set to 0, the MAC RAR is used for the authorized cell. Otherwise, the MAC RAR is used for the unauthorized cell. The UE can parse the MAC RAR based on the R1 field.

[0069] Fig. 9 Another example configuration of a RAR format for an unlicensed cell based on some embodiments of the disclosed technology is shown.

[0070] As described above, the MAC RAR may be configured to include an indication for distinguishing transmissions through licensed cells from transmissions through unlicensed cells. In addition, MAC RARs in different SFNs are multiplexed into one MAC PDU.

[0071] For this solution, the size of the MAC RAR based on some embodiments of the disclosed technology can be expanded. Fig. 9 Another possible example is shown. In order to distinguish MAC RARs based on some embodiments of the disclosed technology, separate MAC PDUs may be generated for licensed cells and unlicensed cells.

[0072] Fig.10 Example configurations of BI subheaders and SFN subheaders based on some embodiments of the disclosed technology are shown. Fig.11 An example of a MAC PDU including a SFN ID based on some embodiments of the disclosed technology is shown.

[0073] In some embodiments of the disclosed technology, MAC RARs in the same SFN are multiplexed into one MAC PDU, and each MAC PDU is generated separately.

[0074] For a UE, multiple cells can be configured, for example, an unlicensed cell acts as a PCell and a licensed cell acts as an SCell. According to the current specification, for an SCell, when a preamble is transmitted on the SCell, a corresponding MAC RAR is transmitted on the PCell. In some embodiments of the disclosed technology, when multiple preambles are received in the same PRACH resource, corresponding MAC RARs from different cells (e.g., PCell and SCell) can be multiplexed into one MAC PDU transmitted in the PCell.

[0075] For unlicensed cells, if the MAC RARs in the same SFN with the same RA-RNTI are multiplexed into one MAC PDU, the following is required: Fig.10 As shown, an SFN id subheader is added or the SFN can be included in the subheader with the BI. Since the SFN id subheader for the authorized cell is not required, the MAC RARs from the unauthorized cell and the authorized cell can be placed in different MAC PDUs, respectively. In other words, two different MAC PDUs are generated for the authorized cell and the unauthorized cell.

[0076] For unlicensed cells, one reserved bit may be used to indicate the BI or SFN ID. In some implementations, the R1 field is set to 0 to indicate a BI subheader, and the R1 field is set to 1 to indicate a SFN subheader. Fig.11An example of a MAC PDU composed of MAC RAR is shown.

[0077] Fig.12 Example configurations of BI subheaders and SFN subheaders for unlicensed cells based on some embodiments of the disclosed technology are shown.

[0078] As with the other examples discussed above, the MAC RARs in the same SFN are multiplexed into one MAC PDU. In some embodiments of the disclosed technology, two different MAC PDUs are generated for the authorized cell and the unauthorized cell. In addition, in order for the UE to distinguish the MAC PDU from the authorized cell or the unauthorized cell, at least one distinguishing indication may be added to the subheader with the BI, such as Fig.12 shown.

[0079] In the subheader with BI, the reserved bit R1 can be used for differentiation purposes. In some embodiments, the R1 field is set to 0 to indicate that the MAC PDU is used for an authorized cell, and R1 is set to 1 to indicate that the MAC PDU is used for an unauthorized cell. The reserved bit R2 is used to indicate BI or SFNID. In one example, R2 is set to 0 to indicate a BI subheader, and R2 is set to 1 to indicate a SFN ID subheader. In some embodiments, the SFN ID can be the LSB of the SFN transmission preamble.

[0080] In this embodiment, MAC RARs from the licensed cell and the unlicensed cell are generated separately. In other words, two different MAC PDUs are generated.

[0081] Fig.13 1 is a flowchart showing an example of a wireless communication method 1300 based on some embodiments of the disclosed technology. The wireless communication method 1300 includes, at step 1310, receiving multiple preambles and multiple corresponding media access control random access responses through multiple cells, at step 1320, when it is determined that multiple preambles are received in the same random access channel resource, multiplexing the multiple corresponding media access control random access responses into one media access control protocol data unit, at step 1330, when it is determined that the multiple corresponding media access control random access responses are in different single frequency networks, adding an indication that the media access control protocol data unit includes multiple media access control random access responses to a media access control subheader, and at step 1340, transmitting the media access control protocol data unit including the media access control subheader with the indication.

[0082] In some embodiments, different single frequency networks have the same random access response. In some embodiments, when multiple preambles and multiple corresponding medium access control random access responses are received through the unlicensed cell, the indication includes the single frequency network preamble.

[0083] In some embodiments, the plurality of cells include authorized cells and unlicensed cells, and wherein the method further comprises adding an additional indication to the media access control subheader to distinguish the authorized cells from the unlicensed cells. In some embodiments, the media access control subheader in the authorized cell has a random access preamble identifier field format different from that of the media access control subheader in the unlicensed cell. In some embodiments, the media access control subheader in the authorized cell and the unlicensed cell has a common field configured to have the same value. The common field may have a first value indicating that the media access control subheader includes a random access preamble identifier field. The common field may have a second value indicating that the media access control subheader includes a random access preamble identifier field and a single frequency network identifier.

[0084] Fig.14 1 is a flowchart showing an example of a wireless communication method 1400 based on some embodiments of the disclosed technology. The wireless communication method 1400 includes, at step 1410, receiving multiple preambles and multiple corresponding media access control random access responses through multiple cells, at step 1420, when it is determined that multiple preambles are received in the same random access channel resource, multiplexing the multiple corresponding media access control random access responses into one media access control protocol data unit, at step 1430, when it is determined that the multiple corresponding media access control random access responses are in different single frequency networks, adding one media access control protocol data unit including an indication of the multiple media access control random access responses to a backoff indicator subheader, and at step 1440, transmitting the media access control protocol data unit including the backoff indicator subheader with the indication.

[0085] In some embodiments, different single frequency networks have the same random access response. In some embodiments, when multiple preambles and multiple corresponding medium access control random access responses are received through the unlicensed cell, the indication includes the single frequency network preamble.

[0086] In some embodiments, the medium access control subheader in the licensed cell has a different backoff indicator field format than the medium access control subheader in the unlicensed cell. In some embodiments, the medium access control subheader in the unlicensed cell has a field indicating whether a certain medium access control random access response is from a new radio cell.

[0087] Fig.151 is a flow chart showing an example of a wireless communication method 1500 based on some embodiments of the disclosed technology. The wireless communication method 1500 includes, at step 1510, receiving multiple preambles and multiple corresponding media access control random access responses through multiple cells, at step 1520, when it is determined that multiple preambles are received in the same random access channel resource, multiplexing the multiple corresponding media access control random access responses into one media access control protocol data unit, and at step 1530, transmitting the media access control protocol data unit. Each of the multiple media access control random access responses includes an indication of distinguishing a portion of the media access control protocol data unit received through a licensed cell from another portion of the media access control protocol data unit received through an unlicensed cell.

[0088] In some embodiments, the MAC random access response in the licensed cell and the unlicensed cell has a common field configured to have the same value. In some embodiments, the common field has a first value indicating the use of the MAC random access response in the licensed cell.

[0089] In some embodiments, the plurality of cells include licensed cells and unlicensed cells, and wherein the method further comprises generating a separate medium access control protocol data unit to distinguish a medium access control random access response received via the licensed cell from a medium access control random access response received via the unlicensed cell. In some embodiments, wherein the medium access control protocol data unit received via the unlicensed cell includes a single frequency network identifier subheader.

[0090] In some embodiments, the medium access control random access response in the licensed cell and the unlicensed cell has a common field configured to indicate a backoff indicator subheader or a single frequency network.

[0091] Fig.161605 is a block diagram representation of a portion of a radio station according to one or more embodiments to which the present technology may be applied. A radio station 1605 (such as a base station or a wireless device (or UE)) may include a processor electronic device 1610 (such as a microprocessor) that implements one or more wireless technologies proposed in the present application. The radio station 1605 may include a transceiver electronic device 1615 to send and / or receive wireless signals through one or more communication interfaces (such as an antenna 1620). The radio station 1605 may include other communication interfaces for transmitting and receiving data. The radio station 1605 may include one or more memories (not explicitly shown) that are configured to store information such as data and / or instructions. In some embodiments, the processor electronic device 1610 may include at least a portion of the transceiver electronic device 1615. In some embodiments, at least some of the disclosed techniques, modules, or functions are implemented using the radio station 1605.

[0092] Some embodiments described herein are described in the general context of a method or process, which may be implemented in one embodiment by a computer program product embodied in a computer-readable medium, including computer executable instructions, such as program code, executed by a computer in a network environment. Computer-readable media may include removable storage devices and non-removable storage devices, including but not limited to read-only memory (ROM), random access memory (RAM), compact disk (CD), digital versatile disk (DVD), etc. Therefore, computer-readable media may include non-transitory storage media. Typically, program modules may include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. Computer or processor executable instructions, related data structures, and program modules represent examples of program codes for executing the steps of the methods disclosed herein. A specific sequence of such executable instructions or related data structures represents an example of corresponding actions for implementing the functions described in these steps or processes.

[0093] Some disclosed embodiments can be implemented as devices or modules using hardware circuits, software or a combination thereof. For example, a hardware circuit implementation may include discrete analog and / or digital components, for example, integrated as a part of a printed circuit board. Alternatively or additionally, the disclosed components or modules may be implemented as application specific integrated circuits (ASICs) and / or field programmable gate arrays (FPGAs) devices. Some embodiments may additionally or alternatively include a digital signal processor (DSP), which is a dedicated microprocessor with an architecture optimized for the operation needs of digital signal processing associated with the disclosed functions of the present application. Similarly, various components or subcomponents within each module may be implemented in software, hardware or firmware. Any of the connection methods and media known in the art may be used to provide connections between modules and / or components within the modules, including but not limited to communication using appropriate protocols over the Internet, wired or wireless networks.

[0094] Although the present application contains many details, these should not be interpreted as limitations on the scope of the claimed invention or the content that may be claimed, but rather as descriptions of the specific features of a particular embodiment. Certain features described in the context of a separate embodiment in the present application may also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments. In addition, although features may be described above as working in certain combinations and even initially claimed, in some cases, one or more features from the claimed combination may be deleted from the combination, and the claimed combination may be directed to a variant embodiment of a sub-combination or sub-combination. Similarly, although operations are depicted in a particular order in the accompanying drawings, this should not be understood as requiring the operations to be performed in the particular order shown or in sequence, or requiring the execution of all shown operations to achieve the desired result.

[0095] Only a few implementations and examples are described, and other implementations, enhancements, and variations may be made based on what is described and illustrated in this disclosure.

Claims

1. A method for wireless communication, comprising: receiving a plurality of preambles and a plurality of corresponding medium access control random access responses over a plurality of cells including a licensed cell and an unlicensed cell, wherein the plurality of preambles are received in a same random access channel resource and the plurality of corresponding medium access control random access responses are in respective different single frequency networks; multiplexing the plurality of corresponding media access control random access responses into one media access control protocol data unit; adding a first value to an indication field in a medium access control subheader to indicate that the one medium access control protocol data unit includes at least one of the plurality of corresponding medium access control random access responses transmitted by the unlicensed cell; or adding a second value to the indication field in the MAC subheader to indicate that the one MAC protocol data unit includes at least one of the plurality of corresponding MAC random access responses transmitted by the granted cell; and transmitting said media access control protocol data unit including said media access control subheader having said indication, The first value indicates that the media access control subheader includes a random access preamble identifier (RAPID) and a single frequency network identifier (SFNID), and the second value indicates that the media access control subheader includes the random access preamble identifier (RAPID) but not the single frequency network identifier (SFNID).

2. The method according to claim 1, wherein: The different single frequency networks have the same random access response.

3. The method according to claim 1, wherein: The medium access control subheader in the licensed cell has a random access preamble identifier field format different from that of the medium access control subheader in the unlicensed cell.

4. A method for wireless communication, comprising: receiving a plurality of preambles and a plurality of corresponding medium access control random access responses over a plurality of cells including a licensed cell and an unlicensed cell, wherein the plurality of preambles are received in a same random access channel resource and the plurality of corresponding medium access control random access responses are in respective different single frequency networks; multiplexing the plurality of corresponding media access control random access responses into one media access control protocol data unit; adding a backoff indicator (BI) to a subheader of the one media access control protocol data unit to indicate an overload condition in the cell; adding a single frequency network indicator (SFNID) to a subheader of the one media access control protocol data unit to indicate that at least one of the plurality of corresponding media access control random access responses in the one media access control protocol data unit is transmitted through the unlicensed cell; as well as The medium access control protocol data unit including a backoff indicator subheader having the indication is transmitted.

5. The method according to claim 4, wherein: The different single frequency networks have the same random access response.

6. A device for wireless communication, the device comprising a memory and a processor, wherein: The processor reads code from the memory and implements the method of any one of claims 1 to 5.

7. A computer-readable program storage medium having codes stored thereon, which, when executed by a processor, cause the processor to implement the method of any one of claims 1 to 5.

Images