CN109565881B - Method and apparatus for implementing contention-based uplink transmission with efficient transmission switching strategy - Google Patents
Method and apparatus for implementing contention-based uplink transmission with efficient transmission switching strategy Download PDFInfo
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- CN109565881B CN109565881B CN201680088070.4A CN201680088070A CN109565881B CN 109565881 B CN109565881 B CN 109565881B CN 201680088070 A CN201680088070 A CN 201680088070A CN 109565881 B CN109565881 B CN 109565881B
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- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
Abstract
A method and apparatus may include determining, by a user equipment, a data packet to transmit to a network node. The method may also include transmitting a first data block of the data packet using contention-based transmission within the contention-based transmission zone. The contention-based transmission region corresponds to a time period between the occurrence of the first preamble and the occurrence of the second preamble. The method may also include switching from contention-based transmission to scheduling-based transmission if not all data blocks of the data packet can be transmitted within the contention-based transmission region. The method may also include transmitting a second data block of the data packet using the schedule-based transmission, wherein the second data block includes data blocks of the data packet that cannot be transmitted within the contention-based transmission zone.
Description
Technical Field
Certain embodiments of the present invention relate to implementing contention-based uplink transmissions by an efficient transmission switching strategy.
Background
Long Term Evolution (LTE) is a standard for wireless communications that seeks to provide improved speed and capacity for wireless communications through the use of new modulation/signal processing techniques. The standard is proposed by the third generation partnership project (3GPP) and is based on previous network technologies. Since its establishment, LTE has been widely deployed in a wide variety of environments involving data communication.
The 5G New Radio (NR) is the next generation wireless system after LTE, where small packet oriented designs need to be handled specifically. For such cases, the physical layer resource management and scheduling methods need to accommodate small payload characteristics to achieve high transmission efficiency in terms of low control overhead and low end-to-end delay.
Disclosure of Invention
According to a first embodiment, a method may comprise determining, by a user equipment, a data packet to be transmitted to a network node. The method may further comprise: within the contention-based transmission zone, a first data block of the data packet is transmitted using contention-based transmission. The contention-based transmission region corresponds to a time period between the occurrence of the first preamble and the occurrence of the second preamble. The method may further comprise: switching from contention-based transmission to scheduling-based transmission if not all data blocks of the data packet can be transmitted within the contention-based transmission region. The method may also include transmitting a second data block of the data packet using the schedule-based transmission. The second data block comprises a data block of the data packet that cannot be transmitted within the contention-based transmission region.
In the method of the first embodiment, the first and second preamble occurrences comprise user equipment specific preamble occurrences and system level occurrences.
In the method of the first embodiment, the first and second preamble occurrences comprise two user equipment specific preamble occurrences.
In the method of the first embodiment, transmitting the data block of the data packet comprises starting preamble transmission in the most recent user equipment specific preamble transmission occurrence.
In the method of the first embodiment, the method may further comprise transmitting the buffer status report with a data block transmitted within the contention-based transmission zone.
In the method of the first embodiment, the number of buffer status reports transmitted in the contention-based transmission zone is configured by the network.
In the method of the first embodiment, the number of first blocks of a data packet using contention based transmission within the contention based transmission zone is configured by the network.
According to a second embodiment, an apparatus may include at least one memory including computer program code. The apparatus may also include at least one processor. The at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to perform the procedures of the first embodiment.
According to a third embodiment, an apparatus may comprise a determining means to determine a data packet to be transmitted to a network node. The apparatus may also include means for transmitting a first data block of a data packet using contention based transmission within the contention based transmission region. The contention-based transmission region corresponds to a time period between the occurrence of the first preamble and the occurrence of the second preamble. The apparatus may further comprise switching means to switch from contention based transmission to scheduling based transmission if not all data blocks of the data packet can be transmitted within the contention based transmission region. The apparatus may also include a second transmitting component to transmit a second data block of the data packet using the schedule-based transmission. The second data block comprises a data block of the data packet that cannot be transmitted within the contention-based transmission region.
In the apparatus of the third embodiment, the first and second preamble occurrences comprise user equipment specific preamble occurrences and system level occurrences.
In the apparatus of the third embodiment, the first and second preamble occurrences comprise two user equipment-specific preamble occurrences.
In the apparatus of the third embodiment, transmitting the data block of the data packet comprises starting preamble transmission in a most recent user equipment specific preamble transmission event.
In the apparatus of the third embodiment, the apparatus may further comprise third transmitting means to transmit the buffer status report with the data block transmitted within the contention-based transmission zone.
According to a fourth embodiment, a computer program product may be embodied on a non-transitory computer readable medium. The computer program product is configured to control a processor to perform the method according to the first embodiment.
According to a fifth embodiment, a method may include configuring, by a network node, a preamble occurrence for a user equipment. The method may also include receiving a data packet from the user equipment. A first data block of the data packet is transmitted by the user equipment using contention-based transmission within a contention-based transmission region, and the contention-based transmission region corresponds to a time period between an occurrence of the first preamble and an occurrence of the second preamble. The method may also include receiving a second data block of the data packet. The second data block is transmitted by the user equipment using a schedule-based transmission, and the second data block comprises a data block of the data packet that cannot be transmitted by the user equipment within the contention-based transmission region.
In the method of the fifth embodiment, the first and second preamble occurrences comprise user equipment specific preamble occurrences and system level occurrences.
In the method of the fifth embodiment, receiving the data block of the data packet comprises receiving a preamble transmission in a most recent user equipment specific preamble transmission occurrence.
In the method of the fifth embodiment, the method further comprises receiving a buffer status report with the data blocks received within the contention-based transmission zone.
According to a sixth embodiment, an apparatus comprises at least one memory including computer program code. The apparatus may also include at least one processor. The at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to perform a process according to the fifth embodiment.
According to a seventh embodiment, an apparatus may comprise means for configuring preamble occurrences for a user equipment. The apparatus may also include first receiving means to receive a data packet from a user equipment. A first data block of the data packet is transmitted by the user equipment using contention-based transmission within a contention-based transmission region, and the contention-based transmission region corresponds to a time period between an occurrence of the first preamble and an occurrence of the second preamble. The apparatus may also include a second receiving component to receive a second data block of the data packet. The second data block is transmitted by the user equipment using a schedule-based transmission. The second data block comprises a data block of the data packet that cannot be transmitted by the user equipment within the contention-based transmission region.
In the apparatus of the seventh embodiment, the first and second preamble occurrences comprise user equipment specific preamble occurrences and system level occurrences.
In the apparatus of the seventh embodiment, receiving the data block of the data packet comprises receiving a preamble transmission in a most recent user equipment-specific preamble transmission event.
In the apparatus of the seventh embodiment, the apparatus may further comprise third receiving means to receive the buffer status report with the data block received within the contention based transmission zone.
In the apparatus of the seventh embodiment, the number of buffer status reports transmitted in the contention-based transmission zone is configured by the network.
In the apparatus of the seventh embodiment, the number of first blocks of a data packet using contention based transmission within a contention based transmission zone is configured by the network.
According to an eighth embodiment, a computer program product may be embodied on a non-transitory computer readable medium. The computer program product is configured to control a processor to perform the method according to the fifth embodiment.
Drawings
For a proper understanding of the invention, reference should be made to the accompanying drawings, in which:
fig. 1 shows a scheduling (contention-free) data transmission procedure for a long term evolution uplink.
Fig. 2 illustrates contention-based transmission zones for user equipment in different subsets in accordance with some embodiments of the present invention.
Fig. 3 illustrates a process for time division multiplexed contention-based transmission in accordance with certain embodiments of the present invention.
FIG. 4 illustrates a flow diagram of a method according to some embodiments of the inventions.
FIG. 5 illustrates a flow diagram of a method according to some embodiments of the inventions.
FIG. 6 illustrates an apparatus according to some embodiments of the inventions.
Fig. 7 illustrates an apparatus according to some embodiments of the inventions.
Fig. 8 illustrates an apparatus according to some embodiments of the inventions.
Detailed Description
Certain embodiments of the present invention relate to implementing contention-based uplink transmissions with an efficient transmission switching strategy. Certain embodiments of the present invention are directed to unscheduled, unlicensed UL multiple access, which is currently being investigated in the 3GPP RAN1 new radio (NR, i.e., 5G). During the RANl #84bis conference, the following protocol is agreed.
Protocol:
(1) non-orthogonal multiple access should be explored for diversified NR usage scenarios and usage scenarios
(2) Autonomous/unlicensed/contention-based non-orthogonal multiple access should be studied, at least for UL mtc
One motivation for introducing non-scheduled multiple access is to improve throughput and efficiency over conventional methods of performing scheduling-based UL transmissions. At least for small packet transmissions, improvements may be achieved in terms of reduced signaling overhead, lower latency, and lower power consumption. Small packet transmission is a typical case of mass machine type communication (mtc) and various smartphone applications. Example applications may include voice over IP (VoIP), gaming applications, transmission control protocol ack (tcp ack), and ultra-high reliable low latency communication (URLLC) with real-time remote control.
Scheduling based transmission is widely used in 3GPP LTE (and HSDPA). When a UE has data available in a logical buffer ready for UL transmission, the UE needs to request uplink resources for data transmission by typically sending a Scheduling Request (SR) to the base station. After the base station successfully detects the SR, the base station will send an UL grant to the UE to allocate a specific PUSCH resource for the UE to send a Buffer Status Report (BSR). After detecting this UL grant, the UE will send a BSR (i.e., the amount of data available in its logical buffer). In a next step, the base station allocates a corresponding UL resource to the UE by means of another UL grant for data transmission, taking into account the uplink radio conditions between the UE and the base station. Fig. 1 shows the above-described process.
Fig. 1 shows a long term evolution uplink scheduling (contention-free) based data transmission procedure. The data transmission process of fig. 1 generally results in a relatively high latency for the base station-UE handshake (typically about 17.5ms for LTE before any data transmission). This transmission procedure may also result in overhead from the exchange of several downlink/uplink (DL/UL) control signaling messages. Thus, the data transmission process of fig. 1 is generally inefficient for massive UL small packet transmissions.
Since 3 months 2016, a 5G research project called New Radio (NR) has been conducted in 3 GPP. RP-160671 outlines the study descriptions and plans. Key scenarios, requirements and Key Performance Indices (KPIs) are specified in 3GPP TR38.913V0.2.0. Furthermore, with the technical documentation R1-162892, uplink contention-based access in 5G new radio, it is possible to try to introduce non-scheduled access to the NR.
Contention-based (CB) transmission may be more efficient for UL small packet transmission in terms of lower overhead and lower latency, but CB transmission may be less efficient for medium to large packet transmission. CB transmissions may be less effective for medium to large packet transmissions due to the semi-statically allocated fixed resource pool(s) typically used for CB data transmissions, and the semi-statically allocated conservative Modulation and Coding Scheme (MCS). From this point of view, it is more efficient to use primarily scheduling-based transmission for such incoming packets.
As a simple approach, the UE may use scheduling-based transmission if the size of the incoming packet is larger than a predefined/configured threshold, otherwise the UE may use contention-based transmission. However, in this way, even if the UEs do not use scheduling-based transmission, the base station needs to allocate a unique Scheduling Request (SR) sequence ID to each UE. Therefore, SR resource shortage may occur in NR having massive connection.
Thus, certain embodiments relate to another method that enables a UE to use contention-based transmission at the beginning. Given the variable nature of incoming data packets, this approach relies on efficient switching between contention-based and scheduling-based transmissions to meet different requirements (e.g., related to latency, overhead, and/or spectral efficiency). Certain embodiments do not require allocation of an SR to a UE, and thus the problem of SR resource shortage can be avoided. In other words, certain embodiments may exploit the principle that CB UEs are not allocated any SR resources. Furthermore, LTE NB-IoT emphasizes that when a large number of internet of things (IoT) UEs are supported, no SR will be assigned to the UE. Certain embodiments of the present invention relate to schemes that enable efficient switching between contention-based and scheduling-based transmissions.
Certain embodiments of the present invention provide new schemes for achieving efficient switching between UL contention-based transmission and UL scheduling-based transmission. The scheme of some embodiments may be based on the basic structure of the transmission preamble between data transmissions. This structure has been pursued by contention-based channel structures. Certain embodiments relate to the following proposals.
According to a proposal of some embodiments, a contention-based transmission region is defined in a time period between two preamble occurrences. Of the two preamble occurrences, one preamble occurrence can be a UE-specific preamble occurrence and the other preamble occurrence can be a system-level preamble occurrence. This is a contention-based transmission based on Time Division Multiplexing (TDM) for different subsets of UEs. It should be noted that if the UE-specific preamble occurrence is the same as the system-specific preamble occurrence, the contention-based transmission area is defined in the time period between every two UE-specific preamble occurrences.
For massive connections in 5G, multiple UEs configured with CB transmissions may be allocated the same resource pool. To reduce the collision rate between UEs, UEs may be grouped into multiple subsets and time division multiplexed transmissions from UEs of different subsets may be used. Since different subsets of UEs use different resources in the time domain, the collision rate can be greatly reduced.
To meet the requirements of time division multiplex transmission under the supported channel structure, two configurations are proposed. One configuration indicates that system level preambles are present. Based on this configuration, the UE making the scheduling-based transmission may perform corresponding rate matching or puncturing. Another configuration indicates UE-specific preamble presence. The UE-specific preamble occurrences are configured on top of the system-level preamble occurrences, and the configuration is the same for UEs in the same subset, but different for UEs in different subsets.
For a particular UE, the time period between each UE-specific preamble occurrence and the next system-level preamble occurrence may be referred to as a contention-based transmission region for the UE. If the UE is to transmit a new data packet, the UE will start preamble transmission in the latest UE-specific preamble transmission occurrence and then transmit UL data blocks in the contention-based transmission region. If the transmission of packets cannot be completed in such an area, the UE will transition to a scheduling-based transmission. Based on the proposed structure, time division multiplexed transmissions from different subsets of UEs are realized by different contention-based zones.
If transmission of a data packet cannot be completed in the CB transmission region, the packet is considered a medium to large packet and the UE uses a schedule-based transmission for transmitting the remaining data bits of the packet. The base station may control the size of the CB transmission region by configuring the period of the system level preamble occurrence.
Fig. 2 illustrates contention-based transmission zones for user equipment in different subsets in accordance with some embodiments of the present invention. Fig. 2 shows an example embodiment, where the system level preamble occurs with a period of T, and the UE specific preamble occurs with a period of 2T.
For UE set 1, the configured UE-specific occurrences include time points n + T, n +3T, n +5T, etc., while for UE set 2, the configured UE-specific occurrences are n, n +2T, n +4T, etc. Contention-based transmission regions for UEs in different subsets are also shown.
Thus, the contention-based transmission region defines the number of Transmission Time Intervals (TTIs) and defines the corresponding number of transport blocks (one transport block per TTI) that can be transmitted using contention-based transmission. If the number of transport blocks separated for an incoming packet is greater than the number that can be transmitted in the contention-based transmission region, the UE will transition to a scheduling-based transmission in order to transmit the remaining transport blocks.
For certain embodiments, the base station may also configure another time period for contention-based transmission, starting with the occurrence of the UE-specific preamble. The size of such a period may be smaller than the CB transmission area. The size of the time period may depend on the predetermined/predicted type of traffic transmitted in the duration and/or on required quality of service (QoS) parameters, e.g. related to delay, and/or reliability. In particular, if high reliability is required while the delay is required to be controlled within a certain range, a sufficiently short period of time should be configured and used for switching from contention based transmission to scheduling based operation. On the other hand, if the traffic Key Performance Index (KPI) is delay tolerant, and if the error rate can be controlled with multiple transmissions, then the time period can be configured with a larger value to save control signaling overhead. In most cases, under this assumption, traffic bursts may be delivered within such a period and there is no need to switch from contention mode to scheduling mode. However, if the buffer size is accumulated by frequent traffic bursts to a sufficiently large value, such accumulation means that the scheduling-based approach is more efficient than the pre-configured contention mode. Here, the UE may then autonomously switch from contention mode to scheduling mode. Accordingly, such adaptive operation can improve the operation efficiency of contention-based access by appropriately configuring the period based on the service type, the predicted traffic density, and the number of UEs.
According to some embodiments of the present invention, some embodiments implement buffer status report piggybacking (BSR piggybacking) in all transport blocks or a configured number of transport blocks transmitted in a CB transmission region. The BSR piggybacks each transport block transmitted in the contention-based transmission region to facilitate robust BSR transmission using the CB. The base station may determine the number of data bits remaining in the buffer and perform corresponding scheduling, if necessary. If there is no data in the buffer, the UE may add an entry or a specific index to indicate a "0-bit BSR" in the transport block. In another embodiment, the base station may configure the UE to perform a maximum number of BSR transmissions in the contention-based transmission region.
With respect to configuring the UE to transmit the maximum number of transport blocks in the CB transmission region, in practice, the maximum number of transport blocks that can be transmitted by the UE in the contention-based transmission region may be configured by the base station. The actual number of transport blocks transmitted in a CB period depends on, for example, the size of the incoming packet, the resources configured for CB transmission, and the configured Modulation and Coding Scheme (MCS).
As described above, certain embodiments of the invention may include some or all of the following inventive aspects. With respect to a contention-based transmission region, the region defines the number of transport blocks or Transmission Time Intervals (TTIs) (for incoming packets) that may be transmitted using contention-based transmissions. The region is defined between a UE-specific preamble occurrence and a system level preamble occurrence. If the incoming packet cannot be completely transmitted in the region, the UE will transition to a schedule-based transmission.
For certain embodiments, the BSR is transmitted with all transport blocks transmitted in the contention-based transmission region. A "0 bit" indication may indicate to the base station that the buffer is empty.
Further, for certain embodiments, the base station may configure the UE for BSR transmission. For example, the base station may configure the UE to perform BSR transmission a maximum number of times in a contention-based transmission region. The base station may configure the maximum number of transport blocks that may be transmitted in the contention-based transmission region.
Fig. 3 illustrates a process of some embodiments of the invention. In the procedure of fig. 3, in a first step, the base station configures the UE to use contention-based UL transmission and configures a resource pool to the UE. The base station also configures system-level preamble occurrences and UE-specific preamble occurrences, respectively. The configuration may include an indication of the period and offset for each type of occurrence.
The system level preamble occurrence may be configured using broadcast signaling. Based on the broadcasted signaling, a UE employing scheduling-based transmission may perform corresponding rate matching or puncturing.
The UE-specific preamble occurrence may be configured using UE-specific signaling, such as, for example, Radio Resource Control (RRC) signaling. The UE-specific preamble occurrence can be configured based on a system level preamble occurrence configuration. For example, the periodicity of the UE-specific preamble occurrences is a multiple of the system-level preamble occurrences, and thus the configuration may be only a multiple and an offset. Referring to the example in fig. 2, the period of occurrence of the UE-specific preamble for both subset 1 and subset 2 UEs is twice the period of occurrence of the system-specific preamble.
The system-level preamble occurrences are common to all subsets of UEs configured in the same resource for contention-based transmission, while the UE-specific preamble occurrences are the same for UEs in the same subset, but different for UEs in different subsets.
If new data arrives at the UE buffer to be transmitted by the UE, the UE will transmit the preamble in the latest UE-specific preamble occurrence and then perform the following data transmission in the CB transmission region. Referring to the example in fig. 2, for UE1 in UE subset 1, if new data arrives between (2T, 3T), UE1 will transmit a preamble in 3T. The UE1 will transmit data transport blocks in the CB transmission region in the TTI between (3T, 4T). If the transmission of the data packet cannot be completed in this region, the UE will switch to a scheduling-based transmission.
Fig. 3 illustrates a process for time division multiplexed contention-based transmission in accordance with certain embodiments of the present invention. A BSR may accompany each transport block transmitted in the contention-based transmission region so that the base station may determine the number of data bits remaining in the buffer. The base station may then perform corresponding scheduling, if necessary. If there is no data in the buffer, the UE will add an entry to indicate a "0 bit BSR" in the transport block. For another embodiment, the base station may configure the UE to perform BSR transmission a maximum number of times in a contention-based transmission region. In such a case, the base station may perform the configuration in the first step.
In practice, the maximum number of transport blocks that can be transmitted by the UE during the time period between the two preamble occurrences may be configured by the base station. In this case, the base station may perform the configuration in the first step. The actual number of transport blocks transmitted in the CB period may depend on, for example, the size of the incoming packet, the resources configured for CB transmission, and the configured MCS.
Certain embodiments of the invention may provide some or all of the following benefits. Some embodiments may enable efficient switching between contention-based and scheduling-based transmissions depending on the size of the incoming packet, thus enabling higher system throughput through adaptive switching. Certain embodiments of the present invention may perform time division multiplexed contention-based transmissions and may thus achieve a low collision rate.
FIG. 4 illustrates a flow diagram of a method according to some embodiments of the inventions. The method may include, at 410, determining, by a user equipment, a data packet to transmit to a network node. The method can also include, at 420, transmitting a first data block of a data packet using contention-based transmission within a contention-based transmission region. The contention-based transmission region corresponds to a time period between the occurrence of the first preamble and the occurrence of the second preamble. The method can also include, at 430, switching from contention-based transmission to scheduling-based transmission if not all data blocks of the data packet can be transmitted within the contention-based transmission zone. The method can also include, at 440, transmitting a second data block of the data packet using the schedule-based transmission, wherein the second data block includes data blocks of the data packet that cannot be transmitted within the contention-based transmission region.
FIG. 5 illustrates a flow diagram of another method according to some embodiments of the inventions. The method can include, at 510, configuring, by a network node, a preamble occurrence for a user equipment. The method can also include, at 520, receiving a data packet from a user device. A first data block of the data packet is transmitted by the user equipment using contention-based transmission within a contention-based transmission region, and the contention-based transmission region corresponds to a time period between an occurrence of the first preamble and an occurrence of the second preamble. The method can also include, at 530, receiving a second data block of the data packet, wherein the second data block is transmitted by the user equipment using the schedule-based transmission and the second data block includes data blocks of the data packet that cannot be transmitted by the user equipment within the contention-based transmission region.
FIG. 6 illustrates an apparatus according to some embodiments of the inventions. In one embodiment, the apparatus may be a network node, such as an evolved node B and/or a base station, for example. In another embodiment, the apparatus may correspond to, for example, a user equipment. The apparatus 10 may include a processor 22 for processing information and executing instructions or operations. The processor 22 may be any type of general or special purpose processor. Although a single processor 22 is shown in FIG. 6, multiple processors may be utilized in accordance with other embodiments. As an example, the processor 22 may also include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DPS), Field Programmable Gate Arrays (FPGA), Application Specific Integrated Circuits (ASIC), and processors based on a multi-core processor architecture.
The apparatus 10 may also include a memory 14, the memory 14 being coupled to the processor 22 for storing information and instructions that may be executed by the processor 22. The memory 14 may be one or more memories, and of any type suitable to the present application environment, and may be implemented using any suitable volatile or non-volatile data storage technology, such as semiconductor-based devices and systems, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. For example, memory 14 may include any combination of: random Access Memory (RAM), Read Only Memory (ROM), static memory (such as a magnetic or optical disk), or any other type of non-transitory machine or computer readable medium. The instructions stored in memory 14 may include program instructions or computer program code that, when executed by processor 22, cause apparatus 10 to perform the tasks described herein.
The apparatus 10 may also include one or more antennas (not shown) for transmitting and receiving signals and/or data to and from the apparatus 10. The apparatus 10 may also include a transceiver 28, the transceiver 28 modulating information onto a carrier wave for transmission by the antenna(s) and demodulating information received via the antenna(s) for further processing by other elements of the apparatus 10. In other embodiments, the transceiver 28 may have the capability to directly send and receive signals or data.
Processor 22 may perform functions associated with operation of apparatus 10 including, but not limited to, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of apparatus 10, including processes related to managing communication resources.
In an embodiment, memory 14 may store software modules that provide functionality when executed by processor 22. The modules may include an operating system 15 that provides operating system functionality for the device 10. The memory may also store one or more functional modules 18 (such as applications or programs) to provide additional functionality for the apparatus 10. The components of the apparatus 10 may be implemented in hardware or as any suitable combination of hardware and software.
FIG. 7 illustrates an apparatus according to some embodiments of the inventions. For example, apparatus 700 may be a user equipment. The arrangement 700 may comprise a determining unit 710, which determining unit 710 determines the data packet to be transmitted to the network node. The apparatus 700 may also include a first transmission unit 720, the first transmission unit 720 transmitting a first data block of a data packet using contention based transmission within the contention based transmission region. The contention-based transmission region corresponds to a time period between the occurrence of the first preamble and the occurrence of the second preamble. The apparatus 700 may further include a switching unit 730, the switching unit 730 switching from contention based transmission to scheduling based transmission in case not all data blocks of a data packet can be transmitted within the contention based transmission region. The apparatus 700 may also include a second transmission unit 740, the second transmission unit 740 transmitting a second data block of the data packet using the schedule-based transmission. The second data block comprises a data block of the data packet that cannot be transmitted within the contention-based transmission region.
FIG. 8 illustrates an apparatus according to some embodiments of the inventions. Apparatus 800 may be, for example, a base station and/or an eNB. The apparatus 800 can include a configuration unit 810, the configuration unit 810 configuring preamble occurrences for user equipment. The apparatus 800 may also include a first receiving unit 820 that receives a data packet from a user equipment, wherein a first data block of the data packet is transmitted by the user equipment using contention based transmission within a contention based transmission region, and the contention based transmission region corresponds to a time period between occurrence of the first preamble and occurrence of the second preamble. The apparatus 800 may further comprise a second receiving unit 830, the second receiving unit 830 receiving a second data block of the data packet, wherein the second data block is transmitted by the user equipment using the schedule-based transmission and the second data block comprises a data block of the data packet that cannot be transmitted by the user equipment within the contention-based transmission region.
The described features, advantages, and characteristics of the invention may be combined in any suitable manner in one or more embodiments. One skilled in the relevant art will recognize that the invention may be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the invention. Those skilled in the art will readily appreciate that the invention as discussed above may be practiced with steps in a different order and/or with hardware in configurations different from those disclosed. Thus, while the invention has been described based upon these preferred embodiments, it would be apparent to those of ordinary skill in the art that certain modifications, variations, and alternative constructions would be apparent, while remaining within the spirit and scope of the invention.
Claims (20)
1. A method for communication, comprising:
determining, by a user equipment, a data packet to be transmitted to a network node;
transmitting a first data block of the data packet using contention-based transmission within a contention-based transmission region, wherein the contention-based transmission region corresponds to a time period between an occurrence of a first preamble and an occurrence of a second preamble;
switching from contention-based transmission to scheduling-based transmission if not all data blocks of the data packet can be transmitted within the contention-based transmission region; and
transmitting a second data block of the data packet using a schedule-based transmission, wherein the second data block comprises a data block of the data packet that cannot be transmitted within the contention-based transmission region.
2. The method of claim 1, wherein the first and second preamble occurrences comprise user equipment-specific and system-level occurrences.
3. The method of claim 1, wherein the first and second preamble occurrences comprise two user equipment-specific preamble occurrences.
4. The method according to any of claims 1-3, wherein transmitting the data block of the data packet comprises starting a preamble transmission in a most recent user equipment specific preamble transmission occurrence.
5. The method of any of claims 1-3, further comprising transmitting a buffer status report with data blocks transmitted within the contention-based transmission zone.
6. The method of claim 5, wherein a number of buffer status reports transmitted in a contention-based transmission region is configured by a network.
7. The method of claim 1, wherein a number of first blocks of the data packet using the contention-based transmission within the contention-based transmission region is configured by the network.
8. An apparatus for communication, comprising:
at least one memory including computer program code;
at least one processor;
wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:
determining a data packet to be transmitted to a network node;
transmitting a first data block of the data packet using contention-based transmission within a contention-based transmission region, wherein the contention-based transmission region corresponds to a time period between an occurrence of a first preamble and an occurrence of a second preamble;
switching from contention-based transmission to scheduling-based transmission if not all data blocks of the data packet can be transmitted within the contention-based transmission region; and
transmitting a second data block of the data packet using a schedule-based transmission, wherein the second data block comprises a data block of the data packet that cannot be transmitted within the contention-based transmission region.
9. The apparatus of claim 8, wherein the first and second preamble occurrences comprise user equipment-specific and system-level occurrences.
10. The apparatus of claim 8, wherein the first and second preamble occurrences comprise two user equipment-specific preamble occurrences.
11. The apparatus of any of claims 8-10, wherein transmitting the data block of the data packet comprises starting a preamble transmission in a most recent user equipment-specific preamble transmission occurrence.
12. The apparatus of any of claims 8-10, further comprising transmitting a buffer status report with a data block transmitted within the contention-based transmission region.
13. A method for communication, comprising:
configuring, by a network node, a preamble occurrence for a user equipment;
receiving a data packet from the user equipment, wherein a first data block of the data packet is transmitted by the user equipment using contention-based transmission within a contention-based transmission region, and the contention-based transmission region corresponds to a time period between an occurrence of a first preamble and an occurrence of a second preamble; and
receiving a second data block of the data packet, wherein the second data block is transmitted by the user equipment using a schedule-based transmission and the second data block comprises a data block of the data packet that cannot be transmitted by the user equipment within the contention-based transmission region.
14. The method of claim 13, wherein the first and second preamble occurrences comprise user equipment-specific preamble occurrences and system level occurrences.
15. The method according to any of claims 13 to 14, wherein receiving the data block of the data packet comprises receiving a preamble transmission in a most recent user equipment specific preamble transmission occurrence.
16. The method of any of claims 13-14, further comprising receiving a buffer status report with a data block received within the contention-based transmission zone.
17. An apparatus for communication, comprising:
at least one memory including computer program code;
at least one processor;
wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:
configuring a preamble occurrence for a user equipment;
receiving a data packet from the user equipment, wherein a first data block of the data packet is transmitted by the user equipment using contention-based transmission within a contention-based transmission region, and the contention-based transmission region corresponds to a time period between an occurrence of a first preamble and an occurrence of a second preamble; and
receiving a second data block of the data packet, wherein the second data block is transmitted by the user equipment using a schedule-based transmission and the second data block comprises a data block of the data packet that cannot be transmitted by the user equipment within the contention-based transmission region.
18. The apparatus of claim 17, wherein the first and second preamble occurrences comprise user equipment-specific and system-level occurrences.
19. The apparatus of any of claims 17-18, wherein receiving the data block of the data packet comprises receiving a preamble transmission in a most recent user equipment-specific preamble transmission occurrence.
20. The apparatus of any of claims 17-18, further comprising receiving a buffer status report with a data block received within the contention-based transmission zone.
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| PCT/CN2016/094611 WO2018027791A1 (en) | 2016-08-11 | 2016-08-11 | Method and apparatus for implementing contention-based uplink transmission with an efficient transmission switching strategy |
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| CN102149206A (en) * | 2010-02-09 | 2011-08-10 | 中兴通讯股份有限公司 | Uplink dispatching method |
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| JP4515312B2 (en) * | 2005-03-31 | 2010-07-28 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile station, transmission method, and mobile radio communication system |
| US7881340B2 (en) * | 2007-10-22 | 2011-02-01 | The Johns Hopkins University | Decentralized media access control for ad-hoc mobile wireless network |
| US8625442B2 (en) * | 2010-08-19 | 2014-01-07 | Motorola Mobility Llc | Method and apparatus for determining when to use contention-based access for transmitting data in a wireless network |
| US9807800B2 (en) * | 2012-10-08 | 2017-10-31 | Mediatek Singapore Pte. Ltd. | Data transmission method |
| WO2015119548A1 (en) * | 2014-02-10 | 2015-08-13 | Telefonaktiebolaget L M Ericsson (Publ) | User equipment, network node and methods therein for handling preamble transmissions on a random access channel in a radio communications network |
| JP6248213B2 (en) * | 2014-02-16 | 2017-12-13 | エルジー エレクトロニクス インコーポレイティド | Data transmission method and apparatus in wireless communication system |
| KR101852825B1 (en) * | 2014-02-16 | 2018-06-11 | 엘지전자 주식회사 | Method and apparatus for transmitting scheduling request using contention-based resources in wireless communication system |
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