TW201806422A - Methods and apparatus for UL data transmission - Google Patents

Abstract

Methods and apparatus are provided for contention-based UL resource reservation and power control for UL non-orthogonal multiple access. In one novel aspect, the UE selects a resource block from a resource pool, sends an uplink message based on the selected resource block requesting a resource reservation with or without a reservation resource request (RRR), and receives a response signal indicating the success of resource reservation. In one embodiment, the resource pool is related to one or more identifications comprising a cell ID, a UE ID, a subframe number, and a frame number, and wherein the UE derives the resource pool based on the one or more identifications. In another novel aspect, the UE selects a power offset from a configured power offset pool and calculates a transmit power based on the path loss, a target power and the selected power offset.

Description

Method and apparatus for uplink data transmission [Cross-reference to related applications]

This application is filed on August 12, 2016 in accordance with 35 USC § 111(a), 35 USC §120, and §365(c), application number PCT/CN2016/094911, entitled "UL DATA TRANSMISSION" The priority of the PCT application is hereby incorporated by reference.

The present invention relates generally to wireless communications and, more particularly, to indications and implementations of uplink (UL) transmissions for UEs.

Machine-Type Communication (MTC) teaches operators important ways and has great potential from an operator perspective. The reduced cost of the MTC UE/device is an important enablement for the realization of the concept of the Internet of Things (IOT). Many MTC devices are designed for low-end (low average cost per user, low data rate) applications that are adequately handled by GSM, GPRS. Due to the low cost (LC) of these devices and the good coverage of GPS/GPRS, there is no great incentive for MTC UE providers to use modules that support the LTE wireless interface. In order to ensure that the MTC UE operators and vendors have a clear business vision to move low-end MTC devices from GSM/GPRS to LTE networks, the new terminal, LC MTC UE, Introduced in version 11. The LC MTC UE is designed to be used in the low-end MTC market to compete with GSM/GPRS terminals. The characteristics of the LC MTC UE are: 1) one receiving antenna; 2: DL and UL maximum transport block size (TBS) size is 1000 bits; 3) bandwidth reduction (BR)--for The resources transmitted per channel are limited to six consecutive PRBs (1.4MHz) to reduce costs, and 4) Coverage Enhancement/Extension (CE) - some applications of LC MTC UEs require 15-20dB coverage extension and Repeated transmission is an accepted technique for compensating for penetration loss.

In LTE Release 12, the half-duplex FDD (HD-FDD) MTC has a receive antenna that is cost competitive. Bandwidth reduction techniques can provide further cost reductions. A UE with bandwidth reduction (BR-UE) can be implemented at a lower cost by reducing the buffer size, signal processing clock rate, and the like. In IoT/MTC services, there are a large number of infrequent small UL traffic data, for example, up to 100-200-bit UL messages, and periodic reporting from 1 hour to 1 year.

Current cellular UL data transmission requires a random access procedure to establish an RRC connection. The signaling overhead is large, and there are hundreds of tuple information exchanges before the RRC setup. It is especially inefficient for small UL traffic information. Need for improvements in UL data transmission.

Methods and apparatus are provided for contention based on contention UL resources, and power control for UL Non-Orthogonal Multiple Access (NOMA).

In a novel aspect, a UE selects a resource block from a pool of resources, and based on the selected resource block, transmits a contention based UL message to a base station, wherein the UL message indicates association with the selected resource block The corresponding UL resources are reserved. The UE receives a response signal in response to the UL message from the base station, wherein the affirmative response signal indicates a successful reservation of the corresponding UL resource. After receiving the positive response message, the UE sends the UL data on the corresponding UL resource. In an embodiment, the UL message includes at least a reservation resource request (RRR), and the affirmative response signal is an authorization signal. In other embodiments, the RRR is selected from multiple RRR types, including: a contention based RRR (CR), and a resource based RRR (RR), and the response signal One of the following response signal types includes: an authorization signal (AR) or a resource based authorization signal (SR).

In another novel aspect, the UE measures the DL signal and obtains a path loss, selects a power difference from the configured power deviation pool, and calculates a transmit power based on the path loss, the target power, and the selected power difference, wherein the target power is a wireless network. The network entity configuration of the road, and the use of the calculated power difference to send UL messages. In one embodiment, the power difference is randomly selected from a set of configured offset values. The set of configured offset values is based on each UL resource, or is cell specific. In another embodiment, the power difference is generated based on a distribution. In still another embodiment, the power difference is generated based on a predefined rule that uses an ID that includes a UE ID, an RNTI, a UE-specific ID, a cell-specific ID, or a group-specific At least one of the IDs.

The following description will be made in conjunction with other embodiments and advantageous effects. The Summary is not intended to limit the invention. The scope of protection of the present invention is based on the scope of the patent application.

100‧‧‧Wireless communication system

101,102‧‧‧eNB

103,104‧‧‧UE

113,112‧‧‧DL communication signals

111,114‧‧‧UL communication signals

121, 122‧‧ ‧ agreement stacking

130,150‧‧‧ Block diagram

131,151‧‧‧ memory

132,152‧‧‧ processor

133,153‧‧‧ transceiver

134, 154‧‧‧ program

141‧‧‧Selector

156‧‧‧UL Resource Manager

157‧‧‧Power Controller

201‧‧‧UE

202‧‧‧Base station

211-216, 221, 222, 231, 232, 241, 242, 251, 252 ‧ ‧ steps

301‧‧‧UE

302‧‧‧Base station

311-316‧‧‧Steps

401‧‧‧UE

402‧‧‧Base station

411-413‧‧‧Steps

500‧‧‧Resource Blocks

510‧‧‧ resource pool

511-515‧‧‧Resource Block

520‧‧‧Resource subpool

521,522,523‧‧‧Resource subpool

601,602,603,604,610‧‧ Resources

621‧‧‧Steps

622‧‧‧Steps

623‧‧‧Steps

701,720,711,721‧‧ Resources

800‧‧ resources

801,802,803‧‧‧Resource Blocks

810‧‧‧DCI

900‧‧‧ Resources

901, 902, 903 ‧ ‧ resource blocks

910‧‧‧DCI

920‧‧‧UE ID

1000‧‧‧ Resources

1001, 1002, 1003‧‧‧ resource blocks

1010‧‧‧DL resources

1011, 1012, 1013‧‧‧ resource blocks

1100‧‧ Resources

1101‧‧‧UE

1102‧‧‧UE

1103‧‧ Resources

1111‧‧‧Power

1112‧‧‧ Power

1121‧‧‧ Target power value

1122‧‧‧Power deviation value

1131‧‧‧Power difference

1132‧‧‧Power difference

1201-1204, 1301-1304‧‧‧ steps

In the figures, like numerals indicate like elements and are used to illustrate embodiments of the invention.

1 is a schematic diagram of an example mobile communication network with support for contention based UL resource reservation and improved UL power control, in accordance with an embodiment of the present invention.

FIG. 2A is a message flow diagram for contention based on contention UL resources, in accordance with an embodiment of the present invention.

Figure 2B is a schematic diagram of different combinations based on contention UL resource reservations, in accordance with an embodiment of the present invention.

Figure 3 is a flow diagram of a contention based resource reservation containing UE ID information, in accordance with an embodiment of the present invention.

Figure 4 is a flow diagram of a UE transmitting a UL message using a contention based resource reservation on a selected resource, in accordance with an embodiment of the present invention.

FIG. 5 is a schematic diagram of a resource pool and a resource subpool for contention based on contention for UL resources, in accordance with an embodiment of the present invention.

Figure 6 is a diagram of resource configuration for RRR, response signals, and UL data transmission, in accordance with an embodiment of the present invention.

Figure 7 is a diagram based on contention mapping, and in accordance with an embodiment of the present invention. Source reservation, a schematic diagram of resource configuration for RRR, response signals, and UL data transmission.

Figure 8 is a schematic diagram of resource mapping using DCI configuration, in accordance with an embodiment of the present invention.

Figure 9 is a schematic diagram of resource mapping configured using DCI and UE ID, in accordance with an embodiment of the present invention.

Figure 10 is a schematic diagram of resource mapping configured using DL resources, in accordance with an embodiment of the present invention.

Figure 11 is a schematic diagram of power control for UL NOMA.

Figure 12 is a flow diagram for reservation based on contention UL resources, in accordance with an embodiment of the present invention.

Figure 13 is a flow chart for UL NOMA power control in accordance with an embodiment of the present invention.

Corresponding digits and symbols in different figures generally refer to the corresponding original unless otherwise indicated. The illustrations are drawn to clearly illustrate the relevant parts of the embodiments of the invention, but are not necessarily drawn to scale.

DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the preferred embodiments embodiments

The use of certain terms throughout the specification and the scope of the patent application refers to the specific original. Those skilled in the art will recognize that a manufacturer can refer to an original by a different name. The originals are not distinguished by name in this document, but are functional. In the following paragraphs and in the scope of the patent application, the words "including" and "including" are used in the open expression, and thus can be translated as "including but not limited to". and Moreover, the term "coupled" refers to a direct or indirect electrical connection. Accordingly, if one device is coupled to another device, the connection can be through a direct electrical connection, through an indirect electrical connection, or through other devices and connections. The indicia and use of the disclosed embodiments are discussed below. However, the invention is understood in a specific context. The specific embodiments discussed are merely examples and are not intended to limit the scope of the invention. Through the various angles and the described embodiments, the same reference digits are used to designate similar originals.

1 is a schematic diagram of a mobile communication network 100 with support for contention based UL resource reservation and improved UL power control, in accordance with an embodiment of the present invention. Wireless communication system 100 includes one or more fixed infrastructure units that form a network that is distributed across a geographic area. Base units may also be referred to as access points, access terminals, base stations, Node Bs, and acting Node Bs (eNode-Bs, eNBs), or other terms in the art. As shown in FIG. 1, the base unit, for example, the eNB 101 and the eNB 102, in a servo area, Serves a plurality of remote units/User Equipments (UEs), such as UEs 103 and 104, servo areas such as sectors, Or sector magnetic area. In some systems, one or more base units are communicatively coupled to a controller to form an access network communicatively coupled to one or more core networks. It is disclosed but not limited to any particular wireless communication system.

In general, eNBs 101 and 102 transmit DL communication signals 112, 113 to UEs 103, and 104, respectively, in the time domain and/or frequency domain and/or code domain. The UEs 103 and 104 communicate with the one or more eNBs 101 and 102 via the UL communication signals 111 and 114, respectively. One or more eNBs 101 and 102 may include one or more transmitters and one or There are multiple receivers that serve the UEs 103 and 104. UEs 103 and 104 can be fixed or mobile user terminals. The UE may also be referred to as a user unit, mobile station, user, terminal, user station, user terminal, or other vocabulary in the art. UEs 103 and 104 have half-duplex or full-duplex transceivers. Half-duplex transceivers transmit and receive at the same time, while full-duplex simultaneous transmission and reception. In one embodiment, one eNB 101 can serve different types of UEs. UEs 103 and 104 may be of different types, such as having different RF bandwidths, or different sub-carrier spacing. UEs belonging to different types can be specified for different use cases or scenarios. For example, some uses, such as MTC, may require very low throughput, delay tolerance, and traffic packet size may be low (eg, 1000 bits per message), CE. Some other use cases, such as smart transportation systems, may be very tight for delays, for example, end-to-end delays of 1 ms. Different UE types may be introduced for these diverse needs. Different frame structures, or system parameters, can also be used to meet some special needs. For example, ignoring some system functions (eg, random access, CSI feedback), or using physical channels/signals for the same function (eg, different reference signals), different UEs may have different RF bandwidths, subcarrier spacing.

FIG. 1 also shows a schematic diagram of control plane protocol stacks 121 and 122 for UE 103 and eNB 101. The UE 103 has a protocol stack 121, which includes a physical layer (physical, PHY), a medium access control layer (MAC), a radio link control (RLC) layer, and a packet data convergence protocol (Packet Data Convergence). Protocol, PDCP) layer and radio resource control (Radio Resource Control) , RRC) layer. Similarly, the base station eNB 101 has a protocol stack 122 including a PHY layer, a MAC layer, an RLC layer, a PDCP layer, and an RRC layer, each of which corresponds to a protocol stack stack corresponding to the UE protocol stack 121.

1 also includes simplified block diagrams 130 and 150 of UEs and eNBs in accordance with the novel aspects of the present invention. The UE 103 has an antenna 135 that transmits and receives wireless signals. An RF transceiver 133, coupled to the antenna, receives an RF signal from the antenna 135, converts it to a baseband signal, and transmits it to the processor 132. The RF transceiver 133 also converts the baseband signal received from the processor 132, The signal is converted to an RF signal and sent to an antenna 135. The processor 132 converts the received baseband signal and invokes different functional modules to implement the functions of the UE 103. The memory 131 stores program instructions and data 134 to control the operation of the UE 103.

As shown, the UE 103 is configured with a processor 132 that implements instructions stored in the memory 131. Processor 132 is configured to implement different functional tasks as shown. The UE 103 also includes a plurality of functional modules that implement tasks in accordance with embodiments of the present invention. The selector 141 selects a resource block from the resource pool in the wireless network. The UL resource manager 142 sends a UL message to the base station based on the selected resource block, wherein the UL message indicates a UL reservation for the corresponding UL resource associated with the selected resource block. The reservation manager 143 receives a response signal from the base station, the response signal being responsive to the UL message, wherein the affirmative response signal indicates a successful reservation of the corresponding UL message. After the contention transmitter 144 receives the affirmative response signal, the UL data is transmitted on the corresponding UL resource. The power deviation manager 143 processes the UL power control process for the UE by applying a power offset value. In another embodiment, multiple circuits are configured to implement one or Multiple tasks. a resource mapping circuit that selects a resource block from a resource pool of the wireless network, and based on the selected resource block, the UL message is sent to the base station, wherein the UL message indicates a correspondence for association with the selected resource block UL reservation for UL resources. The resource mapping circuit receives, from the base station, a response signal responsive to the UL message, wherein the positive response signal indicates that the corresponding UL resource is successfully reserved. The power deviation management circuit processes the UL power control process in which the UE uses the power difference.

A block diagram of eNB 101 is also shown in Figure 1. The ENB has an antenna 155 that transmits and receives wireless signals. An RF transceiver 153, coupled to the antenna, receives a radio frequency (RF) signal from the antenna 155, converts it to a baseband signal, and transmits it to the processor 152. The RF transceiver 153 also converts the baseband signal received from the processor 152. It is converted to an RF signal and sent to the antenna 155. The processor 152 converts the received baseband signals and invokes different functional modules to perform the functions of the eNB 101. The memory 151 stores program instructions and data 154 to control the operation of the eNB 101. The eNB 101 also includes functional modules that implement tasks in accordance with embodiments of the present invention. The UL resource manager 156 handles contention based UL resource reservations. The power control manager 157 processes the new UL power control process by applying a power offset value.

UL data transmission based on contention resource reservation

In IoT/MTC services, there are a large number of infrequent small UL data services, for example, UL periodic reports of up to 100-200 bytes in one hour to one year. Current cellular UL data transmission requires RACH, and establishing an RRC connection is not efficient. There are hundreds of tuple information exchanges before the RRC is established, and the signaling overhead is large. In addition, in order to achieve UL coverage, the narrowband/signal carrier system provides great benefits. The coverage of the hope does not increase the UL TX power. There are multiple tones/resources for the UE to access. Further, having a longer Cyclic Preamble (CP) and a Guard Period (GP) does not require Timing Advance (TA) before data transmission.

Scheduling based UL transmission can significantly reduce signaling overhead. However, there are several issues that need to be addressed. For example, for poor coverage of the UE, the UE may need to transmit for a long time to compensate for the path loss. If the long transmission collides with the transmission of another UE, the power consumption may be too wasteful, so the UE has to retransmit the data. On the other hand, if the transmission is based on contention based rather than scheduling based, it is difficult to support HARQ combining. A method and apparatus are provided for using contention based UL transmission based on contention UL resource reservation.

The uplink control information (UCI) is transmitted in a physical uplink control channel (PUCCH) with or without a transport block in the PUSCH. The UCI includes HARQ, Scheduling Request (SR) channel status information (CSI). The PUCCH allocates a PRB at the edge of the UL system bandwidth. The frequency diversity gain for PUCCH is obtained by frequency hopping between two time slots in a sub-frame. Code Division Multiplexing (CDM) is used for PUCCH multiplexing between different UEs on the same radio resource.

2A is a message flow diagram of a contention based UL resource reservation, in accordance with an embodiment of the present invention. The UE 201 is in a connected mode or an idle mode in a wireless network having the eNB 202. In step 211, the UE 201 sends A contention based resource reservation request (RRR) is sent to the eNB 202. In one case, the RRR is a contention based signal based on the UE ID, or a contention based signal on the resource selected by the UE. At step 212, the eNB 202 sends a response signal. In one embodiment, the response signal is an authorization response signal on a reserved resource associated with the RRR from the UE, or an authorization signal related to the RRR of the UE. In step 213, the UE 201 transmits the UL data to the eNB 202 on the reserved resource, or on the resource corresponding to the RRR. If the UE successfully decodes the grant signal, the UE 201 transmits the UL data on the reserved resource for data transmission, or on the corresponding resource responded in step 212. In one embodiment, a window is set for the UE 201 to decode the grant signal. In another embodiment, if the UE 201 does not correctly decode the grant signal, for example, in the resource mapping (RS_MAP) field, the UE 201 assumes that the reservation failed. The UE 201 can select a new reserved resource from the resource pool and then send the RRR again. In still another embodiment, if the UE 201 does not receive an ACK or NACK signal, the UE 201 may wait for a period of time before transmitting the next request, or wait for a configured time based on the configuration in the SIB from the eNB.

In one embodiment, the UE 201 may implement retransmission after the first UL data transmission. Optionally, in step 214, after the UE sends/retransmits the UL data, the eNB 202 feeds back an ACK/NACK signal. Then, if the UE 201 receives the NACK, in step 215, the UE 201 may perform retransmission until the eNB 202 sends back an ACK. If the UE 201 does not receive an ACK under some conditions, for example, the retransmission timer expires, or the maximum retransmission is reached, the UE 201 returns to the idle mode. If the UE 201 is originally in connected mode, otherwise the UE 201 remains in idle mode if the UE is originally in idle mode.

In one embodiment, the RRR contains a sequence. The ENB202 can detect RRR using low complexity. The UE 201 can send the RRR in a short time to avoid sending a large message. In one embodiment, the RRR message is contention based, referred to as contention-based-RRR (CR). The CR may contain content such as UE ID, RNTI, and chaotic numbers. In another embodiment, the RRR message is an RRR-based resource, which is called Resource-based-RRR (RR). The RR may contain one or more resource information such as time/frequency resources, spreading codes, scrambling codes, and codebooks. Similarly, the response signal to the RRR can be in a different form. In one embodiment, the response signal is an authorization signal, referred to as an Authorization-Response (AR). The AR indicates the authorization used by the resource block or the successful resource reservation of the resource block. The AR is sent to the UE and the eNB on pre-configured or known resources. The UE is blindly detected in the resource group, such as a predefined resource, or may be determined based on the resource, for example, a Frequency Hopping (FH) pattern used in the RRR. Some one-to-one mapping can be defined to avoid blind detection by the UE to save power. In one embodiment, a one-to-one mapping is defined in some resource mapping (RS_MAP) fields of the MAC header. In another example, the response signal is a resource of the response signal, called a resource response (SR). In an example, the grant signal SR may contain a UE ID (UE ID or RNTI), which is similar to the fourth message (message 4, MSG4) currently used for contention resolution. The following diagram gives different scenarios for the RRR and response signals. In conclusion, The request signal may be a contention based signal, such as a CR, or a resource, such as an RR, and the response signal may be a signal such as an AR, or a resource for a response signal, such as an SR.

Figure 2B is a schematic diagram of different combinations based on contention UL resource reservations, in accordance with an embodiment of the present invention. Since there are two kinds of request signals and two kinds of responses, there are four combinations of the above request signals and responses, namely CR+AR, CR+SR (based on resources), RR (based on resources) + AR, and RR (based on resources) ) +SR (based on resources). In the illustration of FIG. 2B, UE 201 is in a connected mode or idle mode in a wireless network with eNB 202.

Diagram 220 shows a scenario in which the UE receives the AR as a CR response. In step 221, the UE 201 sends a UL message with an RRR in the form of a CR. In step 222, the UE 201 receives the response signal in the form of an AR. In one example, UE 201 sends sequence n for RRR. The ENB 202 generates a response signal based on the sequence n . In another example, UE 201 transmits an RRR with a message, such as a UE ID, RNTI, and a random number, and ENB 202 generates a response signal based on the message.

Diagram 230 is a schematic diagram of the UE receiving the AR as a response to the RR. In step 231, the UE 201 sends a UL message with an RRR in the form of an RR. In step 232, the UE receives the response signal in the form of an AR. In one embodiment, the grant signal is generated by the eNB 202 based on the resources of the RRR. The resource of the RRR is a combination of one or more of the following: a time domain/frequency domain resource (a subcarrier is a special case), a spreading code, a scrambling code, and a codebook. In one example, UE 201 selects resource n for the RRR; on resource n , in step 231, UE 201 sends an RR message. The eNB generates a response signal based on the resource n , eg, based on an index, an indicator, or a location of the resource. The resource n may be one or more of the following: a frequency domain/time domain resource (a subcarrier is a special case), a spreading code, a scrambling code, or a codebook. In step 232, the eNB 202 sends an AR to the UE 201.

In the diagrams 220 and 230, for the above two cases, the response signal AR is transmitted on the previously known resource (or UE blindly detected in the resource group), for example, a resource is predefined, or may be determined based on the resources used in step 231 (eg, , FH style (one-to-one mapping to the resources used by the UE). Some one-to-one mapping can be defined to avoid blind detection in the UE to save power. For example, some RS_MAP fields in the MAC header can be defined. One-to-one mapping.

The schematic diagram 240 is a schematic diagram of a scenario in which the UE receives the SR as a response to the CR. In step 241, the UE 201 sends a UL message with an RRR in the form of a CR. In step 242, the UE receives a response signal, eg, resource m , in the form of an SR. In this case, the response signal is based on RR+SR, and the UE selects the resource n for the RRR transmission, where the resource is one or more of the following: time domain/frequency domain resource, spreading code, codebook, scrambling A code, a sequence, a subcarrier index, etc.; the eNB transmits a response signal on the resource m, wherein the resource m is selected by the eNB based on the resource n. In other words, the UE transmits an RRR message on the selected resource n ; the UE detects the response signal on the resource m according to the resource n for the RRR message transmission.

The diagram 250 is a schematic diagram of a scenario in which the UE receives the SR as a response to the CR. In step 251, the UE 201 sends a UL message with an RRR, in the form of an RR, such as resource n . In step 252, the UE 201 receives a response signal in the form of an SR, such as resource m . UE 201 selects resource n for RRR transmission. The resource n is one or more of the following: a time domain/frequency domain resource, a spreading code, a codebook, a scrambling code, a sequence, a subcarrier index, and the like. The eNB transmits a response signal on the resource m . The resource m is selected by the eNB 202 based on the resources. The UE 201 transmits an RRR message on the selected resource n , and on the resource m of the corresponding resource n , detects a response signal, wherein the resource n is an RRR message transmission for itself.

In the diagram 250, the response signal is based on CR+SR, in which case the UE transmits an RRR with content (eg, UE ID, RNTI, random number); the eNB transmits a response signal based on the content in the RRR on the resource m . . For example, the UE transmits an RRR message with a C-RNTI, and the eNB successfully decodes the RRR message, obtains a content C-RNTI, and transmits a response signal on the resource m , where the resource m is a content-based C-RNTI. In this example, the UE detects a response signal on the resource m based on its own C-RNTI.

In one novel aspect, more than one UE may transmit the same or different RRR on the same resource. The eNB may or may not know. If the eNB knows, the eNB can tell the UE NACK. Alternatively, or simply don't send anything, so the UE resends the RRR later. If the eNB does not detect that multiple UEs use the same resource, collisions may occur in data transmission. Then you need to fight for resolution later. In a novel aspect, only one meta-authorization message is required for UL resource reservation, and a current number of information bits, such as UL grant, TA, RNTI, are required for the current agreement to use the second message (MSG2).

Figure 3 is a flow diagram of UE identification information for contention based on contention, in accordance with an embodiment of the present invention. UE 301 is in a connected mode or idle mode in a wireless network with eNB 302. step 311. The UE 301 sends a contention-based UL message with an RRR to the eNb 302. In one embodiment, the RRR includes at least UE identification information, such as a UE ID. The UE identification information may be a UE ID, an RNTI, a random number, a BSR, a CSI, or a Data Volume (DV). And in step 312, the ENB 302 sends a response signal. In one embodiment, the response signal includes for the UL grant on the usage resource of the response signal with UE identification information for contention resolution. In step 313, the UE 301 performs UL data transmission on the reserved resources associated with the UL grant. If the eNB 302 receives and decodes the data, the eNB 302 sends an ACK to the UE in step 314. If the eNB did not successfully decode the information from the UE 301, the ENB 302 sends a NACK to the UE in step 314. The UE may implement retransmission until an ACK is received. The UE 301 goes to the idle mode or the PSM mode to save power. In one embodiment, after NACK, a Semi-Persistent Scheduling (SPS)-like mechanism can be used by the UE so that multiple Transport Blocks (TBs) can be transmitted.

A similar process to PRACH, or referred to as a scheduling request, may be based in part on reserved resources for PRACH. The ENB detects that it is different from the normal PRACH and gives a larger UL grant than the normal UL grant for the PRACH in the response signal. For the eNB, it is considered to be reported by the BSR or DV in the scheduling request for the transport block size (TBS) in the UL grant. The eNB further considers the CSI in the scheduling request to be a Modulation Coding Scheme (MCS) for use in the UL grant. Especially in the NB-IoT system, the reserved bit in the MSG2 can be used for the UL grant in the MSG3, and is used by the UE to select a reserved part in the resource in the PRACH to read the reserved resource.

In this embodiment, the RRR contains an ID (eg, UE ID) (40 bits) or RNTI (16 bits), or a random IE selected by the UE, where the UE ID is used by the eNB 202 to know which UE is transmitting the message. In the second example, in the NB IoT system, MSG3 is 88 bits, including the resume IE, the Est cause, the short MAC-I, the DCI (MAC), and the MAC backup. (spare), PHR, MAC overhead, RRC overhead, RRCspare, DCI is the amount of data in msg3, indicating the amount of UE data (including SMS) and the amount of NAS signaling data, sent on the user plane or control plane. In the DVI field in the MAC. And 88 bits in msg3, which is assumed to be a terabyte size when specified for U1 CCH support. In this example, the multi-tone capability bit can be translated into an IOT bit (in interoperability detection).

Figure 4 is a flow diagram of a UE transmitting UL messages directly on selected resources for contention based resource reservation, in accordance with an embodiment of the present invention. The UE 401 is in a connected mode or idle mode in a wireless network with the eNB 402. In step 411, the UE 401 sends a UL message to the eNB 402. In one embodiment, there is no request for the UE 401 to send UL messages using reserved resources. In another embodiment, the UE 401 may send more than one transport block on the reserved resource, once or several times in step 411. In one embodiment, the UE 401 may send a resource release message in the UL message in step 411. In step 412, the eNB 402 sends an ACK/NACK to the UE 401. From the eNB side, the reserved resources may be for one or more UEs. The UL message of the above step is used as a reservation request message, and the actual request is not embedded in the UL transmission. After receiving the UL message, the eNB uses the reserved resources of the UE for further transmission. After decoding the UL message on the reserved resource, eNb 402 expects one or more UL transmissions on the corresponding UL data transmission resource. No need to express UL authorization. The UL transmission can be non-contention based. Further, in step 412, the eNB 402 may send an ACK or NACK to the UE to trigger a retransmission, or a new transmission. In step 413, the UE 401 sends the UL data to the eNB 402 on the reserved resource.

In one embodiment, the UL message may contain a sequence. The sequence may be further used by the eNB for channel estimation or for eNB decoding if any UEs send requests. Further, eNb can decode this sequence to instruct whether more than one UE requests to use the resource. In one case, the eNB transmits an ACK/NACK signal, and the eNB may be able to detect the sequence on the UL resource, but the decoding of the UL message fails. The ENB can send a NACK signal to trigger a retransmission of the UL message. The UL message further includes: FH style (frequency resource configuration in each frame), and/or start subframe, and/or end subframe, number of repetitions, scrambling sequence, codebook index, spread spectrum code. The UL message contains the UE request to the eNB for all information for subsequent UL data transmission without waiting for explicit authorization from the eNB. In one embodiment, the UL message in step 411 contains all of the material for transmission. The successful transmission of the UL message in step 411 ends the above processing without step 413. The end subframe can be known by the eNB by receiving an "end transmission indicator". Ending the subframe is unnecessary. If a field indicates how many packets need to be sent, the field is indicated by the UE in step 411. In one embodiment, the reserved resources may be centralized or have a decentralized form of FH. Decentralized resources are called discrete resources. It is not necessary to expect contention in UL data transmissions from other UEs. The relationship between reserved resources and resources of response signals can be mapped by preset rules. In one embodiment, in reserve resources and for response signals There are binding relationships between resources, for example, one-to-one mapping.

In a novel aspect, the UE may use a combination of UL messages with or without RRR in different steps, for example for transmission and/or retransmission.

Figure 5 is a schematic diagram of a resource pool and a sub-source sub-pool for contention based UL contention, in accordance with an embodiment of the present invention. Figure 5 shows resource block 500, resource pool 510, and resource subpool 520. Resource block 500 contains different frequency hopping patterns for forming resource blocks. Resource block 511 contains different resources in the frequency/time domain. Similarly, resource blocks 512, 513, 514, and 515 have resources in the frequency/time domain. In one embodiment, resource blocks 511, 512, 513, 514, and 515 form a resource pool 510. The UE may select a resource block from the resource pool 510 for its own UL message to implement a contention based resource reservation procedure. The resource subpool 520 includes a resource subpool 521, a resource subpool 522, and a resource subpool 523. Resource subpool 521 includes resource blocks 511 and 513. Resource subpool 522 includes resource blocks 512 and 515. Resource subpool 523 includes resource block 514.

For reserved resources used in UL messages, the UE selects resources from the resource pool. In one embodiment, the resource pool is known in advance to the UE. In one embodiment, the configuration of the resource pool is broadcast in the SI, indicated by SIB information or other RRC messages. In an embodiment, the resource pool may be related to a sector ID, a UE ID, a subframe number, and a frame number, and the resource pool may indicate or implicitly indicate to the UE. The resources can be separate or shared. If separated, the resources can have a one-to-one mapping.

Resource pool 520 further includes several resource subpools 521, 522, And 523. The partitioning of the resource subpools can be based on different coverage levels/levels, or for channel status levels/levels, or RSRP. The resource pool may include one or more of the following: time frequency resources (one subcarrier is a special case), spreading code, scrambling code, codebook. In another embodiment, the resource pool may be based on frequency hopping, and the different sub-resource pools may be based on different FH patterns, or different frequency allocations. Different UEs can select different reserved resources from the resource pool based on different requirements. In still another embodiment, the eNB may configure one or more RSRP thresholds for the UE to select from different pools of sub-resources. Since the different UEs can be selected in the same resource pool, the UL message is contention based. In a special case, the response message can be in the RS_MAP field of the MAC header.

In a beneficial aspect, since the relationship between the reserved resources and the resources for the response signal is an association, the overhead for UE decoding or eNB transmission is low. In the first aspect, the eNB detects the RRR as a simple manner, which may be a sequence of the PRACH. Further, if the eNB does not receive the RRR, the resource corresponding to the RRR for the response signal may be allocated by the eNB. It is used by other UEs for scheduling-based UL transmission. This can improve the utilization of UL resources because the reserved resources for the RRR are smaller than those for the contention based UL messages, where the contention based UL messages have a large load. Further, from the perspective of the UE, which minimizes the chance of UE wasted, the UE wastes the transmission for sending a message with a large load, but the eNB decoding fails.

In other embodiments of the invention, different FH patterns are used for different UEs. In order to obtain the supported users, and the balance between collision probabilities, the FH pattern is UE-based orthogonality/autocorrelation/cross-correlation. In one example, FH Styles can be hard coded. The variable frequency hopping pattern index can be broadcast at the MAC layer (header, MAC CE), or RRC. The UE obtains the FH style from the broadcast information and randomly selects one from the FH style pool. In one embodiment, the UE obtains or regains SI prior to UL data transmission. In another embodiment, the ENB semi-statically configures the FH pattern and informs the UE. The ENB determines the FH style based on the channel quality of the UE. Similar to the generation of the LTE first code, the FH is generated in accordance with a sequence of FH patterns. The UE randomly inputs parameters to generate an FH pattern. In still another embodiment, an FH pattern (FH style index) is assigned to each UE, and the UE is connected to the network RRC, so the eNb can identify the UE by using the frequency hopping pattern.

Figure 6 is a schematic diagram of resource configuration for RRR, response signals, and reserved resources, in accordance with an embodiment of the present invention. In step 621, the UE UE sends an RRR in the resource 601. In step 622, the UE receives the response signal in resource 602 from the eNB/base station. And a resource 601 for the RRR, a relationship between the resources 602 for the response signal, a relationship between the resources 603, 604 to 610 for the UL message, bound together based on one or more predetermined rules.

Figure 7 is a schematic diagram of resource allocation of RRR, response signal, and reserved resources, in accordance with an embodiment of the present invention. The UE sends an RRR in resource 710 or 720. If the response signal is received, the response signal is an authorization, and the UE later transmits the UL message in the corresponding subframe 711, ... or 721, ... in the subsequent subframe. Resources 711 and 721 are mapped to resources 710 or 720. In one embodiment, the corresponding resources in different subframes are the same, such as 711. In another example, the corresponding resources are different (with frequency hopping) in different subframes, such as block 721.

Figure 8 is a diagram showing the mapping between reserved resources and resources for response signals, in accordance with an embodiment of the present invention. Resource 800 includes a plurality of resource blocks configured for UL transmission of the UE, including resource blocks 801, 802, and 803. Reserved resources for UL messages are one-to-one mapped to resources for ACK/NACK. An ACK NACK for multiple reserved resources is sent together. In one example, a particular DCI 810 format is used for ACK NACK based on contention UL messages. The bits in the DCI are mapped one-to-one to the resources of the UL message. In one embodiment, three bits are mapped to resources 801, 802, and 803, respectively. The RNTI for the special DCI is sector specific. The allocation of reserved resources may be further specified for coverage level/channel conditions, for example, if reserved resources for UL messages, for different coverage levels, or for channel conditions. Each reserved resource has one RNTI. The DL control channel configuration is related to different coverage levels. For example, in NB-IoT, the maximum number of repetitions (Rmax) of the NPDCCH is PRACH level specific. The same RNTI can then be used, but the detection of the DL control channel can be in different configurations.

Figure 9 is a schematic diagram of resource mapping using DCI and UE ID configuration, in accordance with an embodiment of the present invention. Resource 900 includes a plurality of resource blocks configured for use by the UE for UL transmission, including resource blocks 901, 902, and 903. The DL. message may include at least one ACK/NACK response to at least one message. In the DL message, several feedbacks can be sent.

A one-to-one mapping between reserved resources for UL messages and resources for response signals is also applicable in this case. The DCI 910 and the UE ID 920 are included in the response. Since more than one bit can be sent in one case, different values can indicate different meanings. For example, 0 can represent NACK, or there is a UE collision. In this embodiment, a new MAC CE can be introduced to further indicate the meaning of 0. The ENB can inform the victim UE that a separate resource is used if the UL message contains the UE ID 920. For ACK or NACK, but without collision with the UE, 1 bit is sufficient for multiple UEs to know the decoding status of the eNB side. Another field bit on the DL message may contain multiple UE IDs if the eNB successfully decodes more than one UE UL message at the same resource. In one embodiment, the eNb is capable of detecting, by detecting the reference signal, that one or more UEs transmit UL messages (eg, SRS, UL Demodulation Reference, First Code) having one of the resources for the RRR or UL message. For a map. Thus, the ENB can transmit a NACK signal based on the detected signal to the UE, wherein the UE transmits a UL message or RRR on the corresponding UL resource.

Figure 10 is a schematic diagram of resource mapping configured using DL resources, in accordance with an embodiment of the present invention. The resource 1000 includes a plurality of resource blocks configured for the UE for UL transmission, including resource blocks 1001, 1002, and 1003. The DL resource 1010 includes a plurality of resource blocks configured for UL transmission of the UE, including the resource block 1011. , 1012, and 1013. Multiple ACK/NACKs are sent separately. One link, the DL physical channel PHICH, can be introduced as a resource for the response signal. PHICH resources are reserved resources that are mapped one-to-one to UL messages. The UE may send multiple TBs, for example, each TB in a subframe, and an ACK/NACK expected from the eNB for each TB. If the UE receives the ACK, the UE may send the new data and clear the buffer; if the UE receives the NACK, the UE may not clear the data in the buffer. In this case, DTX is not expected because the UE's resources are reserved. In other words, the eNB will expect the UE to send a signal on the reserved resources. The UE can report and send to How many terabytes an eNB has, or how large a TB is, so the eNB and the UE have the same understanding of how long the transmission lasts. For the MTC/NB-IoT/mMTC device, the UE can only transmit one TB because one subframe can carry only one bit. The UE may report the TB size to the eNB for TB size and/or modulation level and coding rate. It can also support HARQ. Although FIG. 8, FIG. 9, and FIG. 10 are described, each bit is used for one UE, but the format for ACK/NACK can be different, and used for different purposes.

Power control with power deviation

There are different first codes in different reserved resources. If the eNB does not find the associated first code in the associated reserved resources, the eNB decides that there is no transmission request in the reserved resources, so the eNB ignores the information in the reserved resources, or replies NACK. . If the eNB finds the associated first code in the associated reserved resource, but it cannot correctly decode the information, it can decide the error, so reply the NACK to the UE to inform the UE that I know that you have sent the information on the reserved resource, but I The information is not decoded correctly, so please retransmit the UL data, and at the same time, the eNB stores the information in the buffer, and jointly decodes the buffer and the next next retransmitted information. In this case, the NACK signal can be 0, or other value, if the NACK signal is a multiple bit. Since multiple UEs can use the same reserved resource, the transmission is based on just right, and if multiple UEs are not orthogonal, or time division, or code division, or have different time offsets, the eNB can successfully receive and decode. UL data from different UEs, under some conditions, in the same reserved resources. For a UE receiving a NACK, this means that the eNB does not successfully decode the UL data, and the UE can retransmit the same UL data after a fixed time, which may be referred to as a synchronous retransmission mode, and the UE may save the UL resource. And, after the UE receives the indication from the eNb for retransmission, retransmit the same UL data, which may be referred to as an asynchronous retransmission mode.

Figure 11 is a schematic diagram of power control for UL NOMA, in accordance with an embodiment of the present invention. The wireless network has multiple UEs, including UE 1101 and UE 1102. Resource 1103 belongs to resource 1110. UE 1101 and UE 1102 selects resource 1103 for UL transmission. The UE 1101 obtains the RSRP and the path loss value, and calculates the target power value 1111. Similarly, the UE 1102 obtains the RSRP and the path loss value, and calculates the target power value 1121. The power difference 1131 between the powers 1111 and 1112 is small. In one novel aspect, the power offset value can be generated by the UE and applied to the target power value. The UE 1101 generates a power offset value of 1112 and applies it to obtain its own transmit power value. Similarly, UE 1102 generates a power offset value of 1122 and applies to derive its own transmit power value. The power difference 1132 after applying the power deviation increases.

UL NOMA is recommended for increased frequency efficiency. In an embodiment of the present invention, for example, Multi-user shared access (MUSA), Resource spread multiple access (RSMA), (Sparse code multiple access, SCMA), ( Pattern defined multiple access (PDMA), Non-orthogonal coded multiple access (NOMA), (Low code rate spreading), (Non-orthogonal multiple access, NOMA). Some techniques require interference cancellation, such as Continuous Interference Cancellation (SIC), which can benefit from power differences. For example, a power domain multi-access receiver (a special case of NOMA) decodes a UE, first using high power, The higher power UE is then eliminated to decode the UE with low power. For scheduling based, it is easy for the eNB to pair UEs on the same resource. However, for contention based UL, open loop power control is expected for the first UL transmission. In one case, the recommendation is divided into several resources, and different resources correspond to different path loss levels. However, this will increase the probability of collision. In this embodiment of the invention, a method is provided to increase the random power deviation, above the open loop power control, comprising: the UE measuring the DL signal, and obtaining a path loss (eg, RSRP), the UE calculating the transmit power based on the path loss , target power (target power configured by the eNB, for example in the SIB) and power deviation (eNb configured random power deviation, eg in the SIB); the UE sends a U1 message (first code, UL traffic), using the transmit power, Select UL resources.

In one embodiment, the power for UE 1101 and UE 1102 is selected from a discrete set of values, such as [-3 dB, 3 dB], or [-2 dB, -1 dB, 0 dB, 1 dB, 2 dB]. This value can be configured by the eNB. In one embodiment, the set of values is based on a configured UL resource. In another example, the set of values is sector specific. In another example, the random power deviation is generated using a decentralized form, for example, a uniform distribution in [-2 dB, 2 dB]. The random power deviation can be turned off by the eNB. For path loss, the maximum transmit power is required, which can also be used for random power deviation, but only with a negative value, or with a zero value in the offset, for example, [-2dB, -1dB, 0dB]. The random power deviation can only be increased to the case of power ramping (that is, without the maximum transmit power). Since the UE with the largest transmit power has a small chance of receiving signal power density is the same. The receiver can take advantage of the different powers caused by the path loss. In another embodiment, the power deviation is based on a pre- The rules are first configured to calculate, for example, UE ID or RNTI, or other UE-specific/group-specific configurations. The above methods can also be used on other non-orthogonal multiple accesses, which can benefit from different powers.

Figure 12 is a flow diagram for reservation based on contention UL resources, in accordance with an embodiment of the present invention. In step 1201, the UE selects a resource block from a resource pool in the wireless communication network. In step 1202, the UE sends a UL message to the base station based on the resource block selected by the UE, where the UL message indicates a UL reservation for the corresponding UL resource associated with the selected resource block. In step 1203, the UE receives a response signal from the base station in response to the UL message, wherein the affirmative response signal indicates a successful reservation of the corresponding UL resource. In step 1204, after receiving the positive response signal, the UE sends the UL data on the corresponding UL resource.

Figure 13 is a flow diagram for UL non-orthogonal multiple access, power control, in accordance with an embodiment of the present invention. In this embodiment, at least two UEs access the system using the RRR request. When at least two UEs select the same RR request, in step 1301, the first UE measures the DL signal and obtains the path loss in the wireless network. In step 1302, the first UE selects a power offset from the configured power deviation pool. In step 1303, the first UE calculates the transmit power based on the path loss, the target power, and the selected power offset, wherein the target power is configured for the network entity of the wireless network. In step 1304, the first UE transmits the UL message using the calculated power. The second UE transmits another UL message using a different power offset, using the calculated transmit power, so the eNB can successfully decode the two UEs on the same resource.

。如果引入功率偏差， 那麼碰撞的概率進一步減少到

。與將一個資源池分為幾個 子集合相比。該方法生成了功率域，以區分UE。 As shown in the above embodiment, there are n resources for contention based UL, where the resources may be time domain/frequency domain/codebook index/scrambling sequence/interleaver/spreading code. The probability that two UEs select the same resource

. If a power deviation is introduced, the probability of collision is further reduced to

. Compared to dividing a resource pool into several sub-collections. The method generates a power domain to distinguish UEs.

The techniques described herein can be used in multiple wireless communication systems, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and others. The term system and network are used interchangeably herein. The CDMA system can be implemented as Universal Terrestrial Radio Access (UTRA) UTRA, CDMA2000, and the like. UTRA includes Time Division Synchronous Code Division Multiple Access (TD-SCDMA), Wideband CDMA (W-CDMA), and other variants of CDMA. The TDMA system can be implemented as GSM. The OFDMA system can be implemented as E-UTRA, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and the like. UTRA and E-UTRA are part of UMTS. 3GPP LTE is a version of UMTS that uses E-UTRA, utilizes OFDMA on the DL, and uses SC-FDMA on the UL. E-UTRA, UMTS, TD-SCDMA, LTE and GSM are used in this application from the 3GP standards organization. Further, such communication systems may additionally include end-to-end (eg, mobile-to-mobile) ad hoc network systems, typically using unpaired unlicensed band spectrum, 802.xx wireless LAN, Bluetooth, and other short distances. Or long distance, wireless communication technology. The above embodiments can be applied to 5G systems, especially new radio (NR) systems, and systems using beam forming or narrowband, and their evolved versions, to those skilled in the art. The narrowband system evolution version includes An evolved version of the NB-IoT system.

While the invention has been described in connection with the specific embodiments thereof, the scope of the invention is not limited thereto. Accordingly, various modifications and combinations of the various features of the various embodiments described herein can be made by those skilled in the art without departing from the scope of the invention.

1201-1204‧‧‧Steps

Claims (10)

An uplink data transmission method includes: selecting, in a mobile communication network, a resource block from a resource pool through a User Equipment (UE); transmitting a base station based on the UE to the base station Competing for an Uplink (UL) message, wherein the UL message is based on a selected resource block, wherein the UL message indicates a reservation of a corresponding UL resource associated with the selected resource block; from the base station Receiving a response signal responsive to the UL message, wherein the response signal indicates that the corresponding UL resource is successfully reserved; and after receiving the positive response signal, transmitting the UL data on the corresponding UL resource. The method of claim 1, wherein the UL message includes at least a reservation resource request (RRR). The method of claim 2, wherein the RRR is selected from a plurality of RRR types, including: a contention based RRR (CR), and a resource based RRR (RR) And wherein the response signal is selected from a plurality of response types, including: an authorization signal (AR) and a resource based authorization signal (SR). The method of claim 3, wherein the response signal is the AR, and wherein the response signal is transmitted on a predefined or pre-configured resource. The method of claim 3, wherein the response signal is the SR, and wherein the response signal is selected based on the RRR at the base station Send on source. The method of claim 3, wherein the RRR message includes a digit n, and wherein the digit n is a sequence in the CR, and a resource number in the RR, and wherein the response signal is based on the Number n. The method of claim 6, wherein the UL message is sent on the selected resource block, and includes one or more transport blocks, and wherein the response signal is an ACK in response to the UL message or A NACK, and wherein the ACK response signal indicates successful reservation of one of the resource blocks for subsequent UL data, and the NACK response signal triggers a UE retransmission, or a new UE transmission. The method of claim 1, wherein the UL message further comprises a UE identification information (ID). A user equipment for uplink data transmission, comprising: a transceiver for receiving and transmitting signals in a communication network; and a selector for selecting a resource block from a resource pool in the communication network; An uplink (UL) resource manager transmitting a contention-based UL message to the base station on the resource block, wherein the UL message indicates a corresponding UL resource associated with the selected resource block Reserved; a reservation manager receiving a response signal from the base station in response to the UL message, wherein the response signal indicates that the corresponding UL resource is successfully reserved; and the transceiver receives the affirmation After the response signal, the UL data is transmitted on the corresponding UL resource. The user equipment of claim 9, wherein the UL message At least one reservation resource request (RRR) is selected, and the RRR is selected from multiple RRR types, including: contention based RRR (CR), and resource based RRR (resource based RRR) , RR), and wherein the response signal is selected from a plurality of response types, including: an authorization signal (AR) and a resource based authorization signal (SR).