CN104184548A - Random access sequence transmission method and device - Google Patents

Abstract

The invention provides a random access sequence transmission method and device, relates to the communication field, and helps to solve the problem that random access signaling sent by MTC UE in a hostile environment can be guaranteed be correctly detected by eNB. The method comprises a first node sends a random access channel configuration message, wherein the random access channel configuration message at least comprises random access channel resource configuration information of a third node. According to the technical scheme provided in the invention, the random access sequence transmission method and device are suitable for M2M services in an LTE system, and higher MTC UE random access performance is realized.

Description

Random access sequence transmission method and device

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting a random access sequence.

Background

Machine Type Communication (MTC) User Equipment (MTC UE), also called Machine to Machine (M2M) User Communication Equipment, is a main application form of the internet of things at present. The low power consumption and the low cost are important guarantees for large-scale application. The M2M devices currently deployed in the market are mainly based on Global System for Mobile communications (GSM) System. In recent years, due to the improvement of spectrum efficiency of Long Term Evolution (LTE)/LTE-a (subsequent Evolution of LTE), more and more mobile operators select LTE/LTE-a as the Evolution direction of future broadband wireless communication systems. An LTE/LTE-a based M2M multi-class data service would also be more attractive. Only when the cost of the LTE-M2M device can be made lower than that of the MTC terminal of the GSM system, the M2M service can be really transferred from the GSM to the LTE system.

The main alternative methods for reducing the cost of the MTC user terminal include: reducing the number of receive antennas of the terminal, reducing the baseband processing bandwidth of the terminal, reducing the peak rate supported by the terminal, employing half-duplex mode, and so on. However, the reduction of the cost means the reduction of the performance, and the requirement for the cell coverage of the LTE/LTE-a system cannot be reduced, so that the MTC terminal adopting the low-cost configuration needs to take some measures to meet the coverage performance requirement of the existing LTE terminal. In addition, the MTC terminal may be located in a basement, a corner, or the like, and is in a worse scenario than the ordinary LTE UE, and in order to compensate for coverage degradation caused by penetration loss and ensure performance indexes of the MTC UEs, it is necessary to perform coverage enhancement of uplink and downlink of the MTC UE for the scenario. How to guarantee the access quality of the MTC UE is the first issue to consider.

In the existing LTE/LTE-a System, 5 transmission formats (also called Preamble formats) of the random access signaling may be configured altogether, that is, Preamble formats 0-4, a base station (Evolved Node B, eNB for short) selects one from the 5 Preamble formats, and transmits configuration Information of the selected Preamble format to the UE through System Information Block (SIB). After acquiring the PRACH Preamble format supported by the current system, the UE generates a random access signaling (also called Message1, Message1, Msg1 for short) according to the currently configured random access sequence and according to the selected specific format of the Preamble format. And the UE sends the random access signaling on the PRACH.

In an LTE/LTE-a system, an eNB detects a Random Access signaling sent by a UE on a PRACH, and once the Random Access signaling sent by the UE is detected, sends a Random Access Response Message (RAR, also called as Message2, Message2, or Msg 2) to the UE.

The location Information of a Physical Resource Block (PRB) occupied by a random access response message in the LTE/LTE-a system is included in Downlink Control Information (DCI) and transmitted through a Physical Downlink Control Channel (PDCCH). In addition, the DCI information further includes a 16-bit Cyclic Redundancy Check (CRC), and the CRC further uses a 16-bit Random Access Radio Network Temporary Identity (RA-RNTI) for scrambling, where the scrambling method is as follows:

c_k(b_k+a_k)mod2k=0,1,...,15

wherein, b_kIs the k +1 th bit in the CRC; a is_kIs the k +1 bit in RA-RNTI; c. C_kIs the (k + 1) th bit generated after scrambling.

However, at this time, it cannot be determined that the RAR message is sent to the UE itself, rather than to other UEs, because there is a possibility that different UEs send the same random access sequence on the same time-frequency resource, and thus they receive the same RAR through the same RA-RNTI. Moreover, the UE does not know whether other UEs are using the same resource for random access. For this reason, the UE needs to resolve such random access collisions through the following Message3 (Message 3, Msg 3) and Message4 (Message 4, Msg 4) messages.

Msg3 is the first message to be transmitted on PUSCH based on uplink scheduling and using harq (hybrid Automatic Repeat request) mechanism. In the initial random access procedure, Msg3 transmits an RRC Connection Request message (RRC Connection Request), if different UEs receive the same RAR message, they obtain the same uplink resource, and simultaneously send Msg3 message, in order to distinguish different UEs, Msg3 carries a UE-specific ID, which can be S-TMSI (if existing) of the UE or a randomly generated 40-bit value, in case of initial access, to distinguish different UE..

The UE starts the Contention Resolution timer immediately after sending the MSg3 message (and restarts the timer for each subsequent Msg3 retransmission), during which time the UE needs to listen for the collision Resolution message (Msg 4 message) returned by the eNodeB to itself.

In order to ensure that the MTC UE can Access the network even in a severe environment, an enhanced design needs to be performed on a Random Access Channel (PRACH) of the LTE/LTE-a system, so as to ensure that the MTC UE can normally Access the system. One of the most important steps is how to ensure that the random access signaling sent by the MTC UE in a harsh environment can be correctly detected by the eNB.

Disclosure of Invention

The invention provides a random access sequence transmission method and a random access sequence transmission device, which solve the problem of ensuring that a random access signaling sent by MTC UE in a severe environment can be correctly detected by an eNB.

A method for random access sequence transmission, comprising:

the first node sends a random access channel configuration message, wherein the random access channel configuration message at least comprises the random access channel resource configuration information of the third node.

Preferably, the random access channel resource configuration information includes at least one of the following:

a configuration period of random access channel resources allocated to the third node;

indication information of frequency hopping enabling of random access channel resources allocated to the third node;

and indicating information of a frequency hopping pattern of the random access channel resource allocated to the third node.

Indication information of random access sequence hopping enabling distributed to the third node;

and indicating information of a random access sequence hopping rule allocated to the third node.

Preferably, the third node is a set of second nodes in one or more P (j, q), and the method further includes:

dividing the second nodes into J sets according to a first predefined rule, wherein each set is defined as P (J), J is more than or equal to 0 and less than or equal to J-1, and J is a positive integer more than or equal to 1;

dividing the second node in P (j) into Q (j) subsets according to a second predefined rule, wherein each subset defines P (j, q), Q (j) is the number of subsets to be divided in the set P (j), Q (j) is more than or equal to 1, and q is more than or equal to 0 and less than or equal to Q (j) -1.

Preferably, the first predefined rule is one of:

dividing the repeated sending times required by the second node for successfully decoding a Physical Broadcast Channel (PBCH) into J value intervals, and determining a set P (J) to which the second node should belong according to the interval in which the repeated times of the PBCH are located when the PBCH is successfully decoded by the second node;

dividing the repeated sending times required by the second node for successfully decoding a Main Information Block (MIB) into J value intervals, and determining a set P (J) to which the second node should belong according to the interval in which the repeated times of the MIB are located when the MIB is successfully decoded by the second node;

dividing the repeated sending times required by the second node for successfully decoding the System Information Block (SIB) into J value intervals, and determining a set P (J) to which the second node should belong according to the interval in which the repeated times of the SIB are located when the SIB is successfully decoded by the second node;

dividing the repeated sending times required by the second node for successfully decoding the Primary Synchronization Signal (PSS) into J value intervals, and determining a set P (J) to which the second node belongs according to the interval in which the repeated times of the PSS are located when the PSS is successfully decoded;

and dividing the repeated sending times required by the second node for successfully decoding the Secondary Synchronization Signal (SSS) into J value intervals, and determining a set P (J) to which the second node belongs according to the interval in which the repeated times of the SSS are positioned when the SSS is successfully decoded by the second node.

Preferably, the second predefined rule is:

dividing the signal quality of the predefined reference signal into Q (j) value intervals, measuring the signal quality of the reference signal by the second node in the set P (j), and determining the subset P (j, q) to which the second node should belong according to the interval in which the measured signal quality of the reference signal is located.

Preferably, the predefined reference signal is at least one of:

a reference signal dedicated to a sector in which the second node is located;

a reference signal dedicated to the second node;

PSS；

SSS；

the channel state indicates a reference signal (CSI-RS).

Preferably, the signal quality is at least one of:

reference Signal Received Power (RSRP);

a Reference Signal Received Quality (RSRQ);

a Received Signal Strength Indication (RSSI);

a path loss value between the second node and the first node;

a downlink signal-to-noise ratio of the second node;

an uplink signal-to-noise ratio of the second node.

Preferably, the number of subsets q (j) =1 of the set p (j) when the second section satisfies at least one of: the number of repetitions of PBCH used when PBCH is successfully decoded by the second node in subset p (j) is greater than a predefined threshold;

when the second node in the subset p (j) successfully decodes the MIB, the number of repetitions of the MIB is larger than a predefined threshold;

when the second node in subset p (j) successfully decodes the SIB, the number of repetitions of the SIB is greater than a predefined threshold;

(ii) the number of repetitions of the PSS is greater than a predefined threshold value when the second node in subset p (j) successfully decodes the PSS;

when the second node in subset p (j) successfully decodes SSS, the number of repetitions of SSS is greater than a predefined threshold;

and when the second node in the subset P (j) successfully decodes the CSI-RS, the repetition number of the CSI-RS is larger than a predefined threshold value.

Preferably, the random access channel resource configuration information further includes at least one of the following:

a threshold value of the number of repetitions of the PBCH;

a threshold value of the number of repetitions of the MIB;

a threshold value of the number of repetitions of the SIB;

a threshold value of the number of repetitions of the PSS;

a threshold value for a number of repetitions of the SSS;

a threshold value of the number of repetitions of the CSI-RS.

Preferably, the mapping relationship between the signal quality interval of the reference signal and the attributed subset P (j, q) is configured by the first node or by the system.

Preferably, the method further comprises:

the second nodes in the subset P (j, q) adjust the transmit power when sending random access signalling.

Preferably, the adjusting the transmission power of the second node in the subset P (j, q) when sending random access signaling comprises at least one of:

after the second node in the subset P (j, q) sends a random access signaling, and when a random access response message sent by the first node is not received, the second node increases the transmission power when sending the random access signaling.

The transmission power when the second node in the subset P (j, q) sends the random access signaling is not configured according to the maximum transmission power;

preferably, the number of subsets q (j) in the set P (j) in which the subset P (j, q) is located is greater than 1.

Preferably, the third node is one or more subsets of the second nodes.

Preferably, the second nodes are divided into S1 subsets according to a predefined rule, S1 is a positive integer greater than or equal to 1, and the predefined rule is at least one of the following:

dividing the coverage enhancement target value into S1 value intervals, and determining a subset to which the second node should belong according to the interval in which the coverage enhancement target value needs to be supported;

dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining a subset to which the second node should belong according to the interval in which the coverage enhancement target value of the random access channel needs to be supported is located;

dividing a coverage enhancement target value of the Msg1 message into S1 value intervals, and determining a subset to which the second node belongs according to the interval in which the coverage enhancement target value of the random access channel needs to be supported is located;

dividing the number of times that the Msg1 message needs to be sent repeatedly into S1 value intervals, and determining a subset to which the second node belongs according to the interval in which the number of times that the Msg1 message needs to be sent repeatedly needs to be supported;

dividing the number of times that the random access sequence needs to be repeatedly sent into S1 value intervals, and determining the subset to which the second node belongs according to the interval in which the number of times that the random access sequence needs to be repeatedly sent needs to be supported;

dividing the repetition times required by the second node when the Physical Broadcast Channel (PBCH) is successfully decoded into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the PBCH are located when the PBCH is successfully decoded by the second node;

dividing the repetition times required by the second node for successfully decoding the MIB into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the MIB are positioned when the second node successfully decodes the MIB;

dividing the repetition times required by the second node for successfully decoding the system information block SIB into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the SIB are located when the SIB is successfully decoded by the second node;

dividing the repetition times required by the second node for successfully decoding the primary synchronization signal PSS into S1 value intervals, and determining the sub-set to which the second node should belong according to the interval in which the repetition times of the PSS are located when the PSS is successfully decoded by the second node;

and dividing the repetition times required by the second node for successfully decoding the secondary synchronization signal SSS into S1 value intervals, and determining the subset to which the second node should belong according to the interval segment in which the repetition times of the SSS are positioned when the SSS is successfully decoded by the second node.

Preferably, in the configuration period of the random access channel resource, multiple PRACH resources are configured in the same first subframe and frequency domain resources occupied by PRACH resources configured in different first subframes are the same, and the PRACH used by the third node to send the random access sequence occupies the same frequency domain resources on different first subframes.

Preferably, in the configuration period of the random access channel resource, when multiple PRACH resources are configured in the same first subframe and frequency domain resources occupied by PRACH resources configured in different first subframes are not completely the same, the third node sends a PRACH used by a random access sequence to occupy the same frequency domain resources on different first subframes.

Preferably, in the configuration period of the random access channel resource, multiple PRACH resources are configured in the same first subframe, and when frequency domain resources occupied by PRACH resources configured in different first subframes are not identical and the number of PRACH resources configured in different first subframes is not identical, the PRACH used by the third node to send the random access sequence occupies the same frequency domain resources on different first subframes.

Preferably, the first subframe is a subframe to which PRACH resources are allocated for the third node.

Preferably, when the indication information of the frequency hopping enabling of the random access channel resource allocated to the third node means frequency hopping enabling or default frequency hopping enabling of the random access channel allocated to the third node, the PRB resources occupied by the random access channel allocated to the third node in the first subframe within the predefined time window are the same, and the PRB resources occupied by the random access channel allocated to the third node in the first subframe between two consecutive predefined time windows are different.

Preferably, at said predeterminedDefining a starting PRB resource occupied by a random access channel allocated to the third node in a time window,the calculation is obtained according to the following expression:

wherein,for the start PRB resource index,

is an offset amount of the PRB,

the total number of PRBs occupied for the uplink,

the number of PRBs occupied for one PRACH,

f_RAthe index of the PRACH resource, or the Frame index number, or the configuration period number of the PRACH, or the subframe number of the starting PRB of the PRACH resource,

k is a positive integer.

Preferably, the PRB resources of the random access channel allocated for the third node are separated by a predefined number of PRBs in the frequency domain between two consecutive predefined time windows.

Preferably, the time period, within the predefined time window,the random access channel allocated for the third node occupies the starting PRB resources,the calculation is obtained according to the following expression:

or

Wherein,

is an offset amount of the PRB,

f_RAthe index of the PRACH resource, or the Frame index number, or the configuration period number of the PRACH, or the subframe number of the starting PRB of the PRACH resource,

k is a positive integer and is a positive integer,

p is a positive integer and is a positive integer,

is the frequency hopping interval.

Preferably, within the predefined time window, when a plurality of PRACH is allocated to the third node in the first subframe, one PRACH is selected from the plurality of PRACH according to a predefined rule, and a random access sequence is sent on the selected PRACH.

Preferably, within the predefined time window, the frequency domain resources occupied by the PRACH selected in different first subframes are different.

Preferably, the frequency domain resources occupied by the PRACH selected in different first subframes are partially or entirely different within the predefined time window.

Preferably, within the predefined time window, N first subframes select a PRACH with the same PRB resources, and two adjacent groups of N first subframes select PRACH resources according to a predefined rule, where N is a positive integer greater than or equal to 1.

Preferably, the predefined rules include at least one of:

indexes of PRACH selected by two adjacent groups of N first subframes are adjacent;

the difference value of PRB resources corresponding to PRACH selected by two adjacent groups of N first subframes on the frequency domain is maximum;

the difference value of PRB resources corresponding to PRACH selected by two adjacent groups of N first subframes on the frequency domain is minimum;

and the difference value of PRB resources corresponding to PRACH selected by two adjacent groups of N first subframes on the frequency domain is configured by the first node or configured by a system.

Preferably, when there are multiple frequency hopping patterns in the position of the PRB resource of the random access channel allocated to the third node in the first subframe, the used frequency hopping pattern is determined according to the frequency hopping pattern indication information of the random access channel resource allocated to the third node.

Preferably, when the meaning of the random access sequence hopping enabling indication information allocated to the third node is enabling, part or all of random access sequences transmitted by the third node in the first subframe in the predefined time window are different.

Preferably, within the predefined time window, the index of the random access sequence transmitted by the third node in the first subframe is determined by at least one of:

an index of the first subframe;

an index of a frame in which the first subframe is located;

an index of a configuration period of the random access channel resource where the first subframe is located;

a PRACH resource index used by the third node in the first subframe;

an index of a random access sequence selected by the third node.

Preferably, in the predefined time window, when there are multiple predefined rules for determining the index of the random access sequence transmitted by the third node in the first subframe, the predefined rule used is determined by the indication information of the random access sequence hopping rule allocated to the third node.

Preferably, when the meaning of the indication information of the jump of the random access sequence allocated to the third node is enable, the random access sequences allocated to the third node within the predefined time window are the same, and the random access sequences allocated to the third node between two consecutive predefined time windows are different.

Preferably, within the predefined time window, the index of the random access sequence transmitted by the third node is determined by at least one of:

an index of the first subframe;

an index of a frame in which the first subframe is located;

an index of a configuration period of the random access channel resource where the first subframe is located;

a PRACH resource index used by the third node in the first subframe;

an index of a random access sequence selected by the third node.

Preferably, the predefined time window refers to at least one of:

k1 subframes, K2 frames, K3 configuration periods of the random access channel resources,

wherein, K1, K2, and K3 are positive integers greater than or equal to 1, and values are configured by the first node or configured by a system.

Preferably, the second node is at least one of:

more than one terminal or terminal group;

more than one MTC terminal or MTC terminal group;

more than one M2M terminal or group of M2M terminals;

more than one device-to-device (D2D) terminal or group of D2D terminals.

Preferably, the system configuration refers to configuration by a standard or by a network higher layer.

Preferably, the first node is at least one of:

a Macro base station (Macro cell), a Micro base station (Micro cell), a Pico base station (Pico cell), a Femto base station (Femto cell), a home base station, a Low Power Node (LPN), and a Relay station (Relay).

The invention also provides a random access sequence transmission device, comprising:

and the configuration issuing module is used for sending a random access channel configuration message, wherein the random access channel configuration message at least comprises the random access channel resource configuration information of the third node.

Preferably, the third node is a set of second nodes in one or more P (j, q), and the apparatus further includes:

the resource management module is used for dividing the second node into J sets according to a first predefined rule, wherein each set is defined as P (J), J is more than or equal to 0 and less than or equal to J-1, J is a positive integer more than or equal to 1, the second node in P (J) is divided into Q (J) subsets according to a second predefined rule, each subset defines P (J, q), Q (J) is the number of the subsets needing to be divided in the set P (J), Q (J) is more than or equal to 1, and q is more than or equal to 0 and less than or equal to Q (J) -1.

The invention provides a random access sequence transmission method and a random access sequence transmission device.A first node sends a random access channel configuration message, wherein the random access channel configuration message at least comprises random access channel resource configuration information of a third node, so that higher MTC UE random access performance is realized, and the problem of ensuring that a random access signaling sent by the MTC UE in a severe environment can be correctly detected by an eNB is solved.

Drawings

Fig. 1 is a schematic diagram of PRACH allocated to MTC UEs within 1 Frame according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of PRACH allocated to MTC UEs within 1 Frame according to a third embodiment of the present invention;

fig. 3 is a schematic diagram of PRACH allocated to MTC UEs within 1 PRACH configuration period according to a third embodiment of the present invention;

fig. 4 is a schematic diagram of PRACH allocated to MTC UEs within 1 PRACH configuration period according to a third embodiment of the present invention;

fig. 5 is a schematic diagram of PRACH allocated to MTC UEs within a configuration period of 2PRACH in the third embodiment of the present invention;

fig. 6 is a schematic diagram of PRACH allocated to MTC UEs within 1 PRACH configuration period when the random access channel resource configuration information further includes frequency hopping enabling indication information in the third embodiment of the present invention;

fig. 7 is a schematic diagram of PRACH allocated to MTC UEs within 2 frames according to a fourth embodiment of the present invention;

fig. 8 is a schematic diagram of the starting PRB resource locations of PRACH transmission opportunities according to a fourth embodiment of the present invention;

fig. 9 is a schematic diagram of PRACH allocated to MTC UEs within 1 Frame according to a fifth embodiment of the present invention;

fig. 10 is a schematic diagram of PRACH allocated for MTC UEs within the Frame0 according to a sixth embodiment of the present invention;

fig. 11 is a schematic diagram of another PRACH allocated for MTC UEs within a Frame0 according to a sixth embodiment of the present invention;

fig. 12 is a schematic structural diagram of a random access sequence transmission apparatus according to an eighth embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

Embodiment one of the invention

MTC UEs and non-MTC UEs exist in the wireless system and are divided into S1 sets according to predefined rules.

The predefined rule is: dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining a set to which the MTC UEs should belong according to the interval in which the coverage enhancement target value of the random access channel needs to be supported.

The maximum Coverage Enhanced Target (Max CET) of PRACH is 15dB, and MTC UEs are divided into 4 (S1 = 4) sets, also called 4 Coverage Enhanced Levels (CEL), e.g., CET =0dB for PRACH of MTC UEs of CEL 0; 0dB < CET < =5dB for PRACH of MTC UEs of CEL 1; 5dB < CET < =10dB for PRACH of MTC UEs of CEL 2; 10dB < CET < =15dB for PRACH of MTC UEs of CEL 3.

The random access channel configuration message includes random access channel resource configuration information, and the MTC UEs may obtain at least one of the following information after decoding the random access channel resource configuration information:

configuring period of PRACH resource of MTC UEs;

in the configuration period, configuration information of a Physical Resource Block (PRB) occupied by the PRACH;

in the configuration period, the configuration information of the subframe occupied by the PRACH;

configuration information of random access sequences allocated for MTC UEs.

In this embodiment, the sending mode of the random access sequence allocated to the MTC UEs is Preamble format0, the time domain length is 1 subframe, and the frequency domain occupies 6 PRBs; the PRACH configuration period of MTC UEs is 1 Frame. In 1 Frame, the PRACH allocated to MTC UEs is shown in fig. 1, the occupied PRBs are PRBs 7-PRB 12, PRBs 37-PRB 42, there are 5 opportunities for PRACH transmission altogether, and the starting resources are PRACH0, PRACH1, PRACH2, PRACH3, and PRACH4, respectively.

In this embodiment, the number of times of repeated transmission of PRACH required by one MTC UE of CEL1 (UE 1) is 8, and UE1 selects a PRACH with the same PRB for transmitting Preamble format 0. The UE1 may send Preamble format0 on PRACH resources of PRB 7-PRB 12, that is, on PRACH0, PRACH1, PRACH2, and PRACH3 of 2 frames. Similarly, the UE1 may also send Preamble format0 on PRACH resources of PRBs 37 to PRBs 42, that is, send Preamble format0 on PRACH4 of 8 frames.

With the exception of the above example of the embodiment, the number of times of repeated transmission of PRACH required by the MTC UE of one CEL1 (UE 1) is 8, and the UE1 selects the PRACH with the same PRB for transmitting Preamble format 0. The UE1 sends Preamble format0 on PRACH resources from PRB7 to PRB12, namely on PRACH0, PRACH1, PRACH2 and PRACH3 of 2 frames. And PRACH resources (PRACH 4) of PRBs 37-42 are reserved for MTC UEs or non-MTC UEs of CEL 0.

In addition to the above examples of the embodiment, the predefined rule may be at least one of the following:

dividing the coverage enhancement target value into S1 value intervals, and determining a subset to which the second node should belong according to the interval in which the coverage enhancement target value needs to be supported;

dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining a subset to which the second node should belong according to the interval in which the coverage enhancement target value of the random access channel needs to be supported is located;

dividing a coverage enhancement target value of the Msg1 message into S1 value intervals, and determining a subset to which the second node belongs according to the interval in which the coverage enhancement target value of the random access channel needs to be supported is located;

dividing the number of times that the Msg1 message needs to be sent repeatedly into S1 value intervals, and determining a subset to which the second node belongs according to the interval in which the number of times that the Msg1 message needs to be sent repeatedly needs to be supported;

dividing the number of times that the random access sequence needs to be repeatedly sent into S1 value intervals, and determining the subset to which the second node belongs according to the interval in which the number of times that the random access sequence needs to be repeatedly sent needs to be supported;

dividing the times of repeated transmission of a Physical Broadcast Channel (PBCH) into S1 value intervals, and determining, by the second node, a subset to which the second node should belong according to a segment in which the repeated times of the PBCH are used when the PBCH is successfully decoded;

dividing the number of times that a main Information Block (Master Information Block, MIB) needs to be repeatedly sent into S1 value intervals, and determining a subset to which the second node belongs according to the interval in which the number of times of repetition of the MIB is located when the MIB is successfully decoded by the second node;

dividing the number of times that a System Information Block (SIB) needs to be repeatedly transmitted into S1 value intervals, and determining a subset to which the SIB belongs according to a Block interval in which the number of times of SIB repetition is located when the SIB is successfully decoded by the second node;

dividing the number of times that a Primary Synchronization Signal (PSS) needs to be sent repeatedly into S1 value intervals, and determining a subset to which the PSS should belong by the second node according to the interval in which the number of times of the PSS is repeated when the PSS is decoded successfully;

dividing the number of times that an auxiliary synchronization Signal (SSS) needs to be sent repeatedly into S1 value intervals, and determining a subset to which the second node should belong according to the interval in which the SSS is repeated when the SSS is decoded successfully by the second node.

Example two of the present invention

MTC UEs and non-MTC UEs exist in a wireless system.

Firstly, dividing MTC UEs into J sets according to a first predefined rule, wherein each set is defined as P (J), J is more than or equal to 0 and less than or equal to J-1, and J is a positive integer more than or equal to 1.

The first predefined rule is:

dividing the times of repeated sending of Secondary Synchronization Signals (SSS) into J value intervals, and determining a set P (J) to which the MTC UE belongs according to the interval in which the repeated times of the SSS are located when the SSS is successfully decoded by the MTC UE.

Then, when the MTC UEs are selected to successfully decode SSS, the subset P (j) of SSS with the repetition number smaller than a predefined threshold value is selected, and the MTC UEs in the P (j) are divided into Q (j) subsets according to a second predefined rule, wherein each subset defines P (j, q); q (j) is the number of subsets to be divided for set P (j), Q (j) is equal to or greater than 1, and 0 is equal to or less than q equal to Q (j) -1; wherein the threshold value of the SSS repetition times is sent in the resource configuration information of the random access channel.

The second predefined rule is:

dividing the signal quality of the predefined reference signal into Q (j) value intervals, measuring the signal quality of the reference signal by the MTC UEs in the subset P (j), and determining the subset P (j, q) which should belong to according to the interval in which the measured signal quality of the reference signal is located.

Wherein the predefined reference signals are: a Cell specific Reference Signal (CRS);

wherein the signal quality is: reference Signal Received Power (RSRP);

wherein, the mapping relation between the RSRP interval of the CRS and the subset P (j, Q (j)) to which the MTC UEs belong is configured by the eNB.

In this embodiment, the threshold value of the SSS repetition number of the MTC UE is sent in the random access channel resource configuration information, and is configured as a, and the MTC UE divides the MTC UE into two sets P (0) and P (1), that is, J =2, according to whether the SSS repetition number is greater than a when the MTC UE successfully decodes the SSS. When the MTC UEs in the set P (0) successfully decode SSS, the number of the SSS repetitions is less than A; when the MTC UEs in the set P (1) successfully decode SSS, the number of the SSS repetitions is greater than or equal to A.

In this embodiment, according to the RSRP value measured by CRS based on MTC UEs in the set P (0), and in descending order, the MTC UEs in the set P (0) are divided into Q (0) =3 subsets, each subset defines P (0, Q), and Q is greater than or equal to 0 and less than or equal to 2. Each subset is defined as P (0, q), and the corresponding RSRP value interval is configured by a standard default or by the eNB.

Therefore, in this embodiment, the MTC UEs are totally divided into 4 subsets, which are P (0,0), P (0,1), P (0,2), and P (1), and may also be called MTC UEs of 4 Coverage Enhanced Levels (CEL). For example, the coverage enhancement level of MTC UEs of P (0,0) is CEL0, the coverage enhancement level of MTC UEs of P (0,1) is CEL1, the coverage enhancement level of MTC UEs of P (0,2) is CEL2, and the coverage enhancement level of MTC UEs of P (1) is CEL 3.

The random access channel configuration message includes random access channel resource configuration information, and the MTC UEs may obtain at least one of the following information after decoding the random access channel resource configuration information:

a configuration period of PRACH allocated for MTC UEs;

in the configuration period, configuring information of Physical Resource Blocks (PRBs) occupied by PRACH allocated for MTC UEs;

in the configuration period, configuring information of subframes occupied by PRACH distributed for MTC UEs;

configuration information of random access sequences allocated for MTC UEs.

In this embodiment, the sending mode of the random access sequence allocated to the MTC UEs is Preamble format0, the length is 1 subframe, and 6 PRBs are occupied; the configuration period of the PRACH allocated for MTC UEs is 1 Frame. In 1 Frame, the PRACH allocated to MTC UEs is shown in fig. 1, the occupied PRBs are PRBs 7-PRB 12, PRBs 37-PRB 42, there are 5 opportunities for PRACH transmission altogether, and the starting resources are PRACH0, PRACH1, PRACH2, PRACH3, and PRACH4, respectively.

If the number of repeated transmission of PRACH required by an MTC UE of CEL1 (UE 1) is 8, UE1 may transmit Preamble format0 on PRACH resources of PRB 7-PRB 12, that is, on PRACH0, PRACH1, PRACH2, and PRACH3 of 2 frames. PRACH resources (PRACH 4) of PRBs 37-42 are reserved for MTC UEs or non-MTC UEs of CEL 0.

The transmission power of the MTC UEs in P (0,0), P (0,1) and P (0,2) when sending the random access signaling can be adjusted, and if the MTC UEs do not receive the random access response message sent by the eNB after sending the random access signaling, the MTC UEs increase the transmission power when sending the random access signaling.

In addition to the above examples of the embodiment, the first predefined rule may be at least one of:

dividing the times of repeated transmission of a Physical Broadcast Channel (PBCH) into J value intervals, and determining a set P (J) to which the second node belongs according to the interval in which the used times of repeated PBCH are located when the PBCH is successfully decoded by the second node;

dividing the number of times that a Master Information Block (MIB) needs to be repeatedly sent into J value intervals, and determining a set P (J) to which the second node belongs according to the interval in which the number of times of the MIB is repeated when the MIB is successfully decoded by the second node;

dividing the number of times that a System Information Block (SIB) needs to be repeatedly transmitted into J value-taking intervals, and determining a set P (J) to which the SIB belongs by the second node according to the interval in which the number of times of SIB repetition is located when the SIB is successfully decoded;

dividing the number of times that a Primary Synchronization Signal (PSS) needs to be sent repeatedly into J value intervals, and determining a set P (J) to which the second node belongs according to the interval in which the PSS is repeated when the PSS is decoded successfully by the second node.

In addition to the above examples of the embodiment, the predefined reference signal may be at least one of:

the Channel State Indication Reference Signal (CSI-RS),

DeModulation Reference Signal (DMRS) of MTC UE,

primary Synchronization Signal (PSS for short),

secondary Synchronization Signal (SSS for short).

In addition to the above examples of the embodiment, the signal quality may be at least one of:

reference Signal Received Quality (RSRQ for short);

received Signal Strength Indicator (RSSI for short);

a pathloss value between the MTC UE and the eNB;

downlink signal-to-noise ratio of MTC UE;

uplink signal-to-noise ratio of MTC UE.

Example three of the invention

MTC UEs and non-MTC UEs exist in the wireless system and are divided into S1 sets according to predefined rules.

The predefined rule is: dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining a set to which the MTC UEs should belong according to the interval in which the coverage enhancement target value of the random access channel needs to be supported.

The maximum Coverage Enhanced Target (Max CET) of PRACH is 15dB, and MTC UEs are divided into 4 (S1 = 4) sets, also called 4 Coverage Enhanced Levels (CEL).

In this embodiment, after the MTC UEs decode the resource configuration information of the random access channel, at least one of the following information may be obtained:

a configuration period of PRACH resources;

in the configuration period, configuration information of a Physical Resource Block (PRB) occupied by the PRACH;

in the configuration period, the configuration information of the subframe occupied by the PRACH;

configuration information of the assigned random access sequence.

In this embodiment, the sending mode of the random access sequence allocated to the MTC UEs is Preamble format0, the length is 1 subframe, and 6 PRBs are occupied; the configuration period of the PRACH allocated for MTC UEs is 1 Frame. In 1 Frame, the PRACH allocated to MTC UEs is shown in fig. 2, the occupied PRBs are PRBs 7-PRBs 12, there are 4 opportunities for PRACH transmission altogether, and the starting resources are PRACH0, PRACH1, PRACH2, and PRACH 3.

When the random access channel resource configuration information further includes the frequency hopping enabling indication information, the PRACH allocated for MTC UEs within 1 PRACH configuration period is as shown in fig. 3, the starting PRB resource location of each PRACH transmission opportunity,calculated according to the following formula:

$n_{\mathrm{PRB}}^{\mathrm{RA}}=\left\{\begin{array}{cc}{n}_{\mathrm{PRBoffset}}^{\mathrm{RA}},& \mathrm{if}{f}_{\mathrm{RA}}\mathrm{mod}2=0\\ N_{\mathrm{RB}}^{\mathrm{UL}}-N_{\mathrm{PRB}}^{\mathrm{RA}}-n_{\mathrm{PRBoffset}}^{\mathrm{RA}},& \mathrm{otherwise}\end{array}\right.,$

wherein,indexing for a starting PRB resource;

for PRB offset, in this embodiment

The total number of PRBs occupied by the uplink is shown in this embodiment

The number of PRBs occupied by one PRACH, in this embodiment

f_RANumbering of opportunities for PRACH transmission, f in this example_RA=0～3；

When the position of the PRB resource of the random access channel allocated for the MTC UE has multiple frequency hopping patterns, the used frequency hopping pattern is determined through the frequency hopping pattern indication information of the random access channel resource allocated for the MTCE.

In addition to the above examples of the embodiment, when the random access channel resource configuration information further includes the frequency hopping enabling indication information, within a configuration period of 1 PRACH, the PRACH allocated for MTC UEs is as shown in fig. 4, the starting PRB resource location of each PRACH transmission opportunity,calculated according to the following formula:

$n_{\mathrm{PRB}}^{\mathrm{RA}}=\left\{\begin{array}{cc}{n}_{\mathrm{PRBoffset}}^{\mathrm{RA}},& \mathrm{if}{T}_{\mathrm{RA}}\mathrm{mod}2=0\\ N_{\mathrm{RB}}^{\mathrm{UL}}-N_{\mathrm{PRB}}^{\mathrm{RA}}-n_{\mathrm{PRBoffset}}^{\mathrm{RA}},& \mathrm{otherwise}\end{array}\right.,$

wherein,indexing for a starting PRB resource;

for PRB offset, in this embodiment

The total number of PRBs occupied by the uplink is shown in this embodiment

The number of PRBs occupied by one PRACH, in this embodiment

T_RASubframe number, T in this embodiment, of the starting PRB of the opportunity for PRACH transmission_RA=2、3、7、8。

In addition to the above examples of the embodiment, when the random access channel resource configuration information further includes the frequency hopping enabling indication information, within a configuration period of 2PRACH, the PRACH allocated for MTC UEs is as shown in fig. 5, the starting PRB resource location of each PRACH transmission opportunity,calculated according to the following formula:

$n_{\mathrm{PRB}}^{\mathrm{RA}}=\left\{\begin{array}{cc}{n}_{\mathrm{PRBoffset}}^{\mathrm{RA}},& \mathrm{ifK}\mathrm{mod}2=0\\ N_{\mathrm{RB}}^{\mathrm{UL}}-N_{\mathrm{PRB}}^{\mathrm{RA}}-n_{\mathrm{PRBoffset}}^{\mathrm{RA}},& \mathrm{otherwise}\end{array}\right.,$

wherein,indexing for a starting PRB resource;

for PRB offset, in this embodiment

The total number of PRBs occupied by the uplink is shown in this embodiment

The number of PRBs occupied by one random access channel, in this embodiment

And K is the Frame index number or the configuration cycle number of the PRACH.

In addition to the above examples of the embodiment, when the random access channel resource configuration information further includes the frequency hopping enabling indication information, the PRACH allocated for MTC UEs within 1 PRACH configuration period is as shown in fig. 6, the starting PRB resource location of each PRACH transmission opportunity,calculated according to the following formula:

wherein,indexing for a starting PRB resource;

for PRB offset, in this embodiment

The total number of PRBs occupied by the uplink is shown in this embodiment

The number of PRBs occupied by one PRACH, in this embodiment

f_RAAn index of PRACH transmission opportunities;

k is the time domain interval of PRACH frequency hopping, where K =2 in this embodiment;

in addition to the above examples of the embodiment, when the random access channel resource configuration information further includes the frequency hopping enabling indication information, within the configuration period of 1 PRACH, the starting PRB resource location of each PRACH transmission opportunity allocated for MTC UEs,calculated according to the following formula:

wherein,indexing for a starting PRB resource;

is PRB offset;

a total number of PRBs occupied for the uplink;

the number of PRBs occupied for one PRACH;

f_RAthe PRACH resource allocation method comprises the steps of obtaining an index of a PRACH transmission opportunity, or a Frame index number, or a configuration cycle number of the PRACH, or a subframe number of a starting PRB of the PRACH transmission opportunity;

k is the hop interval.

Example four of the invention

MTC UEs and non-MTC UEs exist in the wireless system and are divided into S1 sets according to predefined rules.

The predefined rule is: dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining a set to which the MTC UEs should belong according to the interval in which the coverage enhancement target value of the random access channel needs to be supported.

The maximum Coverage Enhanced Target (Max CET) of PRACH is 15dB, and MTC UEs are divided into 4 (S1 = 4) sets, also called 4 Coverage Enhanced Levels (CEL), e.g., CET =0dB for PRACH of MTC UEs of CEL 0; 0dB < CET < =5dB for PRACH of MTC UEs of CEL 1; 5dB < CET < =10dB for PRACH of MTC UEs of CEL 2; 10dB < CET < =15dB for PRACH of MTC UEs of CEL 3.

In this embodiment, the sending mode of the random access sequence allocated to the MTC UEs is Preamble format0, the length is 1 subframe, and 6 PRBs are occupied; the configuration period of the PRACH allocated for MTC UEs is 2 frames. The PRACH allocated to the MTC UEs in 2 frames is shown in fig. 7, the occupied PRBs are PRBs 7 to PRBs 12, there are 8 opportunities for PRACH transmission in total, and the starting resources are PRACH0, PRACH1, PRACH2, PRACH3, PRACH4, PRACH5, PRACH6, and PRACH7, respectively.

When the random access channel resource configuration information further includes frequency hopping enabling indication information, within a configuration period of 1 PRACH, a starting PRB resource position of each PRACH transmission opportunity,calculated according to the following formula:

wherein,

is PRB offset;

a total number of PRBs occupied for the uplink;

the number of PRBs occupied for one PRACH;

f_RAthe PRACH resource allocation method comprises the steps of obtaining an index of a PRACH transmission opportunity, or a Frame index number, or a configuration cycle number of the PRACH, or a subframe number of a starting PRB of the PRACH transmission opportunity;

k is a positive integer;

p is a positive integer

Is a frequency hopping interval;

in order to reserve the resources of the PRB, ${\tilde{N}}_{\mathrm{RB}}^{\mathrm{HO}}=\left\{\begin{array}{cc}{N}_{\mathrm{RB}}^{\mathrm{NO}}+1& \mathrm{if}{N}_{\mathrm{RB}}^{\mathrm{HO}}\mathrm{isodd}\\ N_{\mathrm{RB}}^{\mathrm{HO}}& \mathrm{otherwise}\end{array}\right.$ wherein,configured by higher layers.

In this embodiment, when f_RAWhich is the index of the PRACH transmission opportunity, K1, when p is 3, the starting PRB resource location for each PRACH transmission opportunity in the configuration period of 1 PRACH is as shown in fig. 8.

In addition to the above examples of the embodiment, when the random access channel resource configuration information further includes the frequency hopping enabling indication information, within the configuration period of 1 PRACH, the starting PRB resource location of each PRACH transmission opportunity,calculated according to the following formula:

wherein,

is PRB offset;

a total number of PRBs occupied for the uplink;

the number of PRBs occupied for one PRACH;

f_RAthe PRACH resource allocation method comprises the steps of obtaining an index of a PRACH transmission opportunity, or a Frame index number, or a configuration cycle number of the PRACH, or a subframe number of a starting PRB of the PRACH transmission opportunity;

k is a positive integer;

p is a positive integer

Is a frequency hopping interval;

in order to reserve the resources of the PRB, ${\tilde{N}}_{\mathrm{RB}}^{\mathrm{HO}}=\left\{\begin{array}{cc}{N}_{\mathrm{RB}}^{\mathrm{NO}}+1& \mathrm{if}{N}_{\mathrm{RB}}^{\mathrm{HO}}\mathrm{isodd}\\ N_{\mathrm{RB}}^{\mathrm{HO}}& \mathrm{otherwise}\end{array}\right.$ wherein,configured by higher layers.

In addition to the above examples of the embodiment, when the random access channel resource configuration information further includes the frequency hopping enabling indication information, within the configuration period of 1 PRACH, the starting PRB resource location of each PRACH transmission opportunity,calculated according to the following formula:

<math><mrow> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>=</mo> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>N</mi> <mo>~</mo> </mover> <mi>RB</mi> <mi>HO</mi> </msubsup> <mo>/</mo> <mn>2</mn> <mi>if</mi> <mn>0</mn> <mo>&le;</mo> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <msubsup> <mrow> <mo>&le;</mo> <mover> <mi>N</mi> <mo>~</mo> </mover> </mrow> <mi>RB</mi> <mi>HO</mi> </msubsup> <mo>/</mo> <mn>2</mn> <mo>-</mo> <mn>1</mn> </mrow></math>

<math><mfenced open='' close=''> <mtable> <mtr> <mtd> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>=</mo> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>-</mo> <msubsup> <mover> <mi>N</mi> <mo>~</mo> </mover> <mi>RB</mi> <mi>HO</mi> </msubsup> <mo>/</mo> <mn>2</mn> <mo>-</mo> <msubsup> <mi>N</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mi>if</mi> <msubsup> <mi>N</mi> <mi>RB</mi> <mi>UL</mi> </msubsup> <mo>-</mo> <msubsup> <mover> <mi>N</mi> <mo>~</mo> </mover> <mi>RB</mi> <mi>HO</mi> </msubsup> <mo>/</mo> <mn>2</mn> <msubsup> <mrow> <mo>-</mo> <mi>N</mi> </mrow> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>+</mo> <mn>1</mn> <mo>&le;</mo> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>&le;</mo> </mtd> </mtr> <mtr> <mtd> <msubsup> <mi>N</mi> <mi>RB</mi> <mi>UL</mi> </msubsup> <mo>-</mo> <mn>1</mn> <mo>,</mo> </mtd> </mtr> </mtable> </mfenced></math>

wherein,is PRB offset;

a total number of PRBs occupied for the uplink;

the number of PRBs occupied for one PRACH;

f_RAthe PRACH resource allocation method comprises the steps of obtaining an index of a PRACH transmission opportunity, or a Frame index number, or a configuration cycle number of the PRACH, or a subframe number of a starting PRB of the PRACH transmission opportunity;

k is a positive integer;

p is a positive integer;

is a frequency hopping interval;

is a reserved PRB resource.

In addition to the above examples of the embodiment, when the random access channel resource configuration information further includes the frequency hopping enabling indication information, within the configuration period of 1 PRACH, the starting PRB resource location of each PRACH transmission opportunity,calculated according to the following formula:

<math><mrow> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>=</mo> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>+</mo> <msubsup> <mover> <mi>N</mi> <mo>~</mo> </mover> <mi>RB</mi> <mi>HO</mi> </msubsup> <mo>/</mo> <mn>2</mn> <mi>if</mi> <mn>0</mn> <mo>&le;</mo> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <msubsup> <mrow> <mo>&le;</mo> <mover> <mi>N</mi> <mo>~</mo> </mover> </mrow> <mi>RB</mi> <mi>HO</mi> </msubsup> <mo>/</mo> <mn>2</mn> <mo>-</mo> <mn>1</mn> </mrow></math>

<math><mfenced open='' close=''> <mtable> <mtr> <mtd> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>=</mo> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>-</mo> <msubsup> <mover> <mi>N</mi> <mo>~</mo> </mover> <mi>RB</mi> <mi>HO</mi> </msubsup> <mo>/</mo> <mn>2</mn> <mo>-</mo> <msubsup> <mi>N</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mi>if</mi> <msubsup> <mi>N</mi> <mi>RB</mi> <mi>UL</mi> </msubsup> <mo>-</mo> <msubsup> <mover> <mi>N</mi> <mo>~</mo> </mover> <mi>RB</mi> <mi>HO</mi> </msubsup> <mo>/</mo> <mn>2</mn> <msubsup> <mrow> <mo>-</mo> <mi>N</mi> </mrow> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>+</mo> <mn>1</mn> <mo>&le;</mo> <msubsup> <mi>n</mi> <mi>PRB</mi> <mi>RA</mi> </msubsup> <mo>&le;</mo> </mtd> </mtr> <mtr> <mtd> <msubsup> <mi>N</mi> <mi>RB</mi> <mi>UL</mi> </msubsup> <mo>-</mo> <mn>1</mn> <mo>,</mo> </mtd> </mtr> </mtable> </mfenced></math>

wherein,is PRB offset;

a total number of PRBs occupied for the uplink;

the number of PRBs occupied for one PRACH;

f_RAthe PRACH resource allocation method comprises the steps of obtaining an index of a PRACH transmission opportunity, or a Frame index number, or a configuration cycle number of the PRACH, or a subframe number of a starting PRB of the PRACH transmission opportunity;

k is a positive integer;

p is a positive integer;

is a frequency hopping interval;

is a reserved PRB resource.

Example five of the invention

MTC UEs and non-MTC UEs exist in the wireless system and are divided into S1 sets according to predefined rules.

The predefined rule is: dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining a set to which the MTC UEs should belong according to the interval in which the coverage enhancement target value of the random access channel needs to be supported.

The maximum Coverage Enhanced Target (Max CET) of PRACH is 15dB, and MTC UEs are divided into 4 (S1 = 4) sets, also called 4 Coverage Enhanced Levels (CEL), e.g., CET =0dB for PRACH of MTC UEs of CEL 0; 0dB < CET < =5dB for PRACH of MTC UEs of CEL 1; 5dB < CET < =10dB for PRACH of MTC UEs of CEL 2; 10dB < CET < =15dB for PRACH of MTC UEs of CEL 3.

The random access channel configuration message sent to the MTC UEs includes a plurality of random access channel resource configuration information, where each random access channel resource configuration information includes one or more mtues of the CEL. In this embodiment, the random access channel configuration message includes 4 pieces of random access channel resource configuration information, and each piece of random access channel resource configuration information includes MTC UEs of one CEL.

After the MTC UEs decode the random access channel resource configuration information, at least one of the following information may be obtained:

a configuration period of PRACH allocated for MTC UEs;

in the configuration period, configuring information of Physical Resource Blocks (PRBs) occupied by PRACH allocated for MTC UEs;

in the configuration period, configuring information of subframes occupied by PRACH distributed for MTC UEs;

configuration information of random access sequences allocated for MTC UEs.

In this embodiment, the sending mode of the random access sequence allocated to the MTC UEs of CEL1 is Preamble format0, the length is 1 subframe, and occupies 6 PRBs, and the allocation period of the allocated PRACH is 1 Frame. The PRACH allocated to MTC UEs within 1 Frame is shown in fig. 9, where the occupied PRBs are PRBs 7-PRBs 12, and PRBs 3-PRBs 42, and there are 6 opportunities for PRACH transmission altogether, and the starting resources are PRACH0, PRACH1, PRACH2, PRACH3, PRACH4, and PRACH5, respectively.

When the random access channel resource configuration information further includes the frequency hopping enabling indication information, the UE1 is an MTC UE of CEL1, and the resource location of the PRACH occupied by the UE1 sending the Preamble within the configuration period of 1 PRACH is as shown in fig. 9, that is, PRACH0, PRACH3, and PRACH 4.

Example six of the invention

MTC UEs and non-MTC UEs exist in the wireless system and are divided into S1 sets according to predefined rules.

The predefined rule is: dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining a set to which the MTC UEs should belong according to the interval in which the coverage enhancement target value of the random access channel needs to be supported;

the maximum Coverage Enhanced Target (Max CET) of PRACH is 15dB, and MTC UEs are divided into 4 (S1 = 4) sets, also called 4 Coverage Enhanced Levels (CEL), e.g., CET =0dB for PRACH of MTC UEs of CEL 0; 0dB < CET < =5dB for PRACH of MTC UEs of CEL 1; 5dB < CET < =10dB for PRACH of MTC UEs of CEL 2; 10dB < CET < =15dB for PRACH of MTC UEs of CEL 3.

The random access channel configuration message sent to the MTC UEs comprises a plurality of random access channel resource configuration information, and each random access channel resource configuration information comprises one or more CEL MTC UEs. In this embodiment, the random access channel configuration message includes 4 pieces of random access channel resource configuration information, and each piece of random access channel resource configuration information includes MTC UEs of one CEL.

After the MTC UEs decode the random access channel resource configuration information, at least one of the following information may be obtained:

a configuration period of PRACH allocated for MTC UEs;

in the configuration period, configuring information of Physical Resource Blocks (PRBs) occupied by PRACH allocated for MTC UEs;

in the configuration period, configuring information of subframes occupied by PRACH distributed for MTC UEs;

configuration information of random access sequences allocated for MTC UEs.

In this embodiment, the sending mode of the random access sequence allocated to the MTC UEs of CEL1 is Preamble format0, the length is 1 subframe, and occupies 6 PRBs, and the allocation period of the allocated PRACH is 1 Frame. As shown in fig. 10, the PRACH allocated to the MTC UEs in the Frame0 occupies PRBs 7 to PRBs 12, and PRBs 3 to PRBs 42, and there are 6 opportunities for PRACH transmission in total, the starting resources are PRACH0, PRACH1, PRACH2, PRACH3, PRACH4, and PRACH5, and the PRACH positions allocated to the MTC UEs in other frames are the same as those of the Frame 0.

When the random access channel resource configuration information further includes frequency hopping enabling indication information, and when the starting resource for sending the Preamble by the MTC UE of CEL1 is Frame0Subframe2PRACH0, the MTC UEs of CEL1 may arbitrarily select one group of resources from the following several groups of PRACH resources to send the Preamble:

1、Frame0Subframe2PRACH0、Frame0Subframe3PRACH5、Frame1Subframe2PRACH2、Frame1Subframe3PRACH1、Frame2Subframe2PRACH4；Frame2Subframe3PRACH3、Frame3Subframe2PRACH0、Frame3Subframe3PRACH5、……；

2、Frame0Subframe2PRACH0、Frame0Subframe3PRACH5、Frame1Subframe2PRACH2、Frame1Subframe3PRACH5、Frame2Subframe2PRACH0；Frame2Subframe3PRACH5、Frame3Subframe2PRACH2、Frame3Subframe3PRACH5、……；

3、Frame0Subframe2PRACH0、Frame0Subframe3PRACH5、Frame1Subframe2PRACH2、Frame1Subframe3PRACH5、Frame2Subframe2PRACH0；Frame2Subframe3PRACH5、Frame3Subframe2PRACH2、Frame3Subframe3PRACH5、……；

4、Frame0Subframe2PRACH0、Frame0Subframe3PRACH1、Frame1Subframe2PRACH2、Frame1Subframe3PRACH3、Frame2Subframe2PRACH4；Frame2Subframe3PRACH5、Frame3Subframe2PRACH0、Frame3Subframe3PRACH1、……。

except for the above example of the embodiment, the sending mode of the random access sequence allocated to the MTC UEs of CEL1 is Preamble format0, the length is 1 subframe, and occupies 6 PRBs, and the allocation period of the allocated PRACH is 1 Frame. As shown in fig. 11, the PRACH allocated to the MTC UEs in the Frame0 occupies PRBs 7 to PRB12 and PRBs 3 to PRB42, and there are 6 opportunities for transmitting the PRACH in total, the starting resources are PRACH0, PRACH1, PRACH2, PRACH3, PRACH4, and PRACH5, and the PRACH positions allocated to the MTC UEs in other frames are the same as Frame 0.

When the random access channel resource configuration information further includes frequency hopping enabling indication information, and when the starting resource for sending the Preamble by the MTC UE of CEL1 is Frame0Subframe2PRACH0, the MTC UEs of CEL1 may arbitrarily select one group of resources from the following several groups of PRACH resources to send the Preamble:

1、Frame0Subframe2PRACH0、Frame0Subframe3PRACH3、Frame1Subframe2PRACH4、Frame1Subframe3PRACH1、Frame2Subframe2PRACH2；Frame2Subframe3PRACH5、Frame3Subframe2PRACH0、Frame3Subframe3PRACH3、……；

2、Frame0Subframe2PRACH0、Frame0Subframe3PRACH3、Frame1Subframe2PRACH4、Frame1Subframe3PRACH3、Frame2Subframe2PRACH0；Frame2Subframe3PRACH3、Frame3Subframe2PRACH4、Frame3Subframe3PRACH3、……；

3、Frame0Subframe2PRACH0、Frame0Subframe3PRACH1、Frame1Subframe2PRACH2、Frame1Subframe3PRACH3、Frame2Subframe2PRACH4；Frame2Subframe3PRACH5、Frame3Subframe2PRACH0、Frame3Subframe3PRACH1、……；

4、Frame0Subframe2PRACH0、Frame0Subframe3PRACH1、Frame1Subframe2PRACH2、Frame1Subframe3PRACH3、Frame2Subframe2PRACH4；Frame2Subframe3PRACH5、Frame3Subframe2PRACH2、Frame3Subframe3PRACH3、……。

example seven of the invention

MTC UEs and non-MTC UEs exist in the wireless system and are divided into S1 sets according to predefined rules.

The predefined rule is: dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining a set to which the MTC UEs should belong according to the interval in which the coverage enhancement target value of the random access channel needs to be supported.

The maximum Coverage Enhanced Target (Max CET) of PRACH is 15dB, and MTC UEs are divided into 4 (S1 = 4) sets, also called 4 Coverage Enhanced Levels (CEL), e.g., CET =0dB for PRACH of MTC UEs of CEL 0; 0dB < CET < =5dB for PRACH of MTC UEs of CEL 1; 5dB < CET < =10dB for PRACH of MTC UEs of CEL 2; 10dB < CET < =15dB for PRACH of MTC UEs of CEL 3.

The random access channel configuration message includes random access channel resource configuration information, and the MTC UEs may obtain at least one of the following information after decoding the random access channel resource configuration information:

configuring period of PRACH resource of MTC UEs;

in the configuration period, configuration information of a Physical Resource Block (PRB) occupied by the PRACH;

in the configuration period, configuration information of subframes occupied by the PRACH;

configuration information of random access sequences allocated for MTC UEs.

In this embodiment, the sending mode of the random access sequence allocated to the MTC UEs is Preamble format0, the length is 1 subframe, and 6 PRBs are occupied; the configuration period of the PRACH allocated for MTC UEs is 1 Frame. In 1 Frame, the PRACH allocated to MTC UEs is shown in fig. 2, the occupied PRBs are PRBs 7-PRBs 12, there are 4 opportunities for PRACH transmission altogether, and the starting resources are PRACH0, PRACH1, PRACH2, and PRACH 3.

When the random access channel resource configuration information further includes the frequency hopping enabling indication information, the PRACH allocated for MTC UEs within 1 PRACH configuration period is as shown in fig. 3, the starting PRB resource location of each PRACH transmission opportunity,calculated according to the following formula:

$n_{\mathrm{PRB}}^{\mathrm{RA}}=\left\{\begin{array}{cc}{n}_{\mathrm{PRBoffset}}^{\mathrm{RA}},& \mathrm{if}{f}_{\mathrm{RA}}\mathrm{mod}2=0\\ N_{\mathrm{RB}}^{\mathrm{UL}}-N_{\mathrm{PRB}}^{\mathrm{RA}}-n_{\mathrm{PRBoffset}}^{\mathrm{RA}},& \mathrm{otherwise}\end{array}\right.$

wherein,indexing for a starting PRB resource;

for PRB offset, in this embodiment

The total number of PRBs occupied by the uplink is shown in this embodiment

The number of PRBs occupied by one PRACH, in this embodiment

f_RANumbering of opportunities for PRACH transmission, f in this example_RA=0～3。

When the random access channel resource configuration information further includes random access sequence hopping enabling indication information, and the indication information means enabling, the MTC UEs send different random access sequences on the first subframe within 1 PRACH configuration period. The first subframe is a subframe in which PRACH resources are allocated to MTC UEs within a PRACH configuration period, in this embodiment, PRACH0, PRACH1, PRACH2, and PRACH3 in fig. 2.

The index of the random access sequence transmitted in the first subframe is determined by at least one of:

an index of the first subframe;

an index of a frame in which the first subframe is located;

an index of a configuration period of a PRACH where a first subframe is located;

a PRACH resource index used by the third node in a first subframe;

index of random access sequence selected by MTC UE.

When the index of the random access sequence sent by the MTC UE in the first subframe is determined to have various predefined rules, the used predefined rule is determined through the random access sequence hopping rule indication information distributed to the MTC UE.

Except for the above example in this embodiment, when the random access channel resource configuration information further includes random access sequence hopping enabling indication information, and the indication information means enabling, the random access sequences used by the MTC UEs in the same PRACH configuration period are the same, and the random access sequences used by the MTC UEs in adjacent PRACH configuration periods are different.

Example eight of the invention

An embodiment of the present invention provides a random access sequence transmission apparatus, where the structure of the apparatus is shown in fig. 12, and the apparatus includes:

a configuration issuing module 1201, configured to send a random access channel configuration message, where the random access channel configuration message at least includes resource configuration information of a random access channel of a third node.

Preferably, the third node is a set of second nodes in one or more P (j, q), and the apparatus further includes:

the resource management module 1202 is configured to divide the second node into J sets according to a first predefined rule, where each set is defined as P (J), J is greater than or equal to 0 and less than or equal to J-1, and J is a positive integer greater than or equal to 1, divide the second node in P (J) into Q (J) subsets according to a second predefined rule, each subset defines P (J, q), Q (J) is the number of subsets that the set P (J) needs to be divided into, Q (J) is greater than or equal to 1, and q is greater than or equal to 0 and less than or equal to Q (J) -1.

It should be noted that, in the embodiment of the present invention, the random access channel design for MTC is taken as an example for description, and for the discovery channel of the UE of D2D, the technical solution provided in the embodiment of the present invention is also applicable, and is not described herein again.

Example nine of the invention

The embodiment of the invention provides a random access sequence transmission method, which comprises the following steps:

1. and dividing the second nodes into J sets according to a first predefined rule, wherein each set is defined as P (J), J is more than or equal to 0 and less than or equal to J-1, and J is a positive integer more than or equal to 1.

2. Dividing the second node in P (j) into Q (j) subsets according to a second predefined rule, wherein each subset defines P (j, q), Q (j) is the number of subsets to be divided in the set P (j), Q (j) is more than or equal to 1, and q is more than or equal to 0 and less than or equal to Q (j) -1.

The third node is a set of second nodes in one or more of P (j, q).

Preferably, the first predefined rule is one of:

dividing the repeated sending times required by the second node for successfully decoding a Physical Broadcast Channel (PBCH) into J value intervals, and determining a set P (J) to which the second node should belong according to the interval in which the repeated times of the PBCH are located when the PBCH is successfully decoded by the second node;

dividing the repeated sending times required by the second node for successfully decoding a Main Information Block (MIB) into J value intervals, and determining a set P (J) to which the second node should belong according to the interval in which the repeated times of the MIB are located when the MIB is successfully decoded by the second node;

dividing the repeated sending times required by the second node for successfully decoding the System Information Block (SIB) into J value intervals, and determining a set P (J) to which the second node should belong according to the interval in which the repeated times of the SIB are located when the SIB is successfully decoded by the second node;

dividing the repeated sending times required by the second node for successfully decoding the Primary Synchronization Signal (PSS) into J value intervals, and determining a set P (J) to which the second node belongs according to the interval in which the repeated times of the PSS are located when the PSS is successfully decoded;

and dividing the repeated sending times required by the second node for successfully decoding the Secondary Synchronization Signal (SSS) into J value intervals, and determining a set P (J) to which the second node belongs according to the interval in which the repeated times of the SSS are positioned when the SSS is successfully decoded by the second node.

Preferably, the second predefined rule is:

dividing the signal quality of the predefined reference signal into Q (j) value intervals, measuring the signal quality of the reference signal by the second node in the set P (j), and determining the subset P (j, q) to which the second node should belong according to the interval in which the measured signal quality of the reference signal is located.

Preferably, the predefined reference signal is at least one of:

a reference signal dedicated to a sector in which the second node is located;

a reference signal dedicated to the second node;

PSS；

SSS；

the channel state indicates a reference signal (CSI-RS).

Preferably, the signal quality is at least one of:

reference Signal Received Power (RSRP);

a Reference Signal Received Quality (RSRQ);

a Received Signal Strength Indication (RSSI);

a path loss value between the second node and the first node;

a downlink signal-to-noise ratio of the second node;

an uplink signal-to-noise ratio of the second node.

Preferably, the number of subsets q (j) =1 of the set p (j) when the second section satisfies at least one of: the number of repetitions of PBCH used when PBCH is successfully decoded by the second node in subset p (j) is greater than a predefined threshold;

when the second node in the subset p (j) successfully decodes the MIB, the number of repetitions of the MIB is larger than a predefined threshold;

when the second node in subset p (j) successfully decodes the SIB, the number of repetitions of the SIB is greater than a predefined threshold;

(ii) the number of repetitions of the PSS is greater than a predefined threshold value when the second node in subset p (j) successfully decodes the PSS;

when the second node in subset p (j) successfully decodes SSS, the number of repetitions of SSS is greater than a predefined threshold;

and when the second node in the subset P (j) successfully decodes the CSI-RS, the repetition number of the CSI-RS is larger than a predefined threshold value.

Preferably, the random access channel resource configuration information further includes at least one of the following:

a threshold value of the number of repetitions of the PBCH;

a threshold value of the number of repetitions of the MIB;

a threshold value of the number of repetitions of the SIB;

a threshold value of the number of repetitions of the PSS;

a threshold value for a number of repetitions of the SSS;

a threshold value of the number of repetitions of the CSI-RS.

Preferably, the mapping relationship between the signal quality interval of the reference signal and the attributed subset P (j, q) is configured by the first node or by the system.

Preferably, the method further comprises:

the second nodes in the subset P (j, q) adjust the transmit power when sending random access signalling.

Preferably, the adjusting the transmission power of the second node in the subset P (j, q) when sending random access signaling comprises at least one of:

after the second node in the subset P (j, q) sends a random access signaling, and when a random access response message sent by the first node is not received, the second node increases the transmission power when sending the random access signaling.

The transmission power when the second node in the subset P (j, q) sends the random access signaling is not configured according to the maximum transmission power;

preferably, the number of subsets q (j) in the set P (j) in which the subset P (j, q) is located is greater than 1.

3. The first node sends a random access channel configuration message, wherein the random access channel configuration message at least comprises the random access channel resource configuration information of the third node.

Preferably, the random access channel resource configuration information includes at least one of the following:

a configuration period of random access channel resources allocated to the third node;

indication information of frequency hopping enabling of random access channel resources allocated to the third node;

and indicating information of a frequency hopping pattern of the random access channel resource allocated to the third node.

Indication information of random access sequence hopping enabling distributed to the third node;

and indicating information of a random access sequence hopping rule allocated to the third node.

Preferably, the third node is one or more subsets of the second nodes.

Preferably, the second nodes are divided into S1 subsets according to a predefined rule, S1 is a positive integer greater than or equal to 1, and the predefined rule is at least one of the following:

dividing the coverage enhancement target value into S1 value intervals, and determining a subset to which the second node should belong according to the interval in which the coverage enhancement target value needs to be supported;

dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining the subset to which the second node belongs according to the interval in which the coverage enhancement target value of the random access channel needs to be supported is located;

dividing a coverage enhancement target value of the Msg1 message into S1 value intervals, and determining a subset to which the second node belongs according to the interval in which the coverage enhancement target value of the random access channel needs to be supported is located;

dividing the number of times that the Msg1 message needs to be sent repeatedly into S1 value intervals, and determining a subset to which the second node belongs according to the interval in which the number of times that the Msg1 message needs to be sent repeatedly needs to be supported;

dividing the number of times that the random access sequence needs to be repeatedly sent into S1 value intervals, and determining the subset to which the second node belongs according to the interval in which the number of times that the random access sequence needs to be repeatedly sent needs to be supported;

dividing the repetition times required by the second node when the Physical Broadcast Channel (PBCH) is successfully decoded into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the PBCH are located when the PBCH is successfully decoded by the second node;

dividing the repetition times required by the second node for successfully decoding the MIB into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the MIB are positioned when the second node successfully decodes the MIB;

dividing the repetition times required by the second node for successfully decoding the system information block SIB into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the SIB are located when the SIB is successfully decoded by the second node;

dividing the repetition times required by the second node for successfully decoding the primary synchronization signal PSS into S1 value intervals, and determining the sub-set to which the second node should belong according to the interval in which the repetition times of the PSS are located when the PSS is successfully decoded by the second node;

and dividing the repetition times required by the second node when successfully decoding the secondary synchronization signal SSS into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the SSS are positioned when successfully decoding the SSS.

Preferably, in the configuration period of the random access channel resource, multiple PRACH resources are configured in the same first subframe, and the frequency domain resources occupied by the PRACH resources configured in different first subframes are the same, and the PRACH used by the third node to send the random access sequence occupies the same frequency domain resources on different first subframes.

Preferably, in the configuration period of the random access channel resource, when multiple PRACH resources are configured in the same first subframe and frequency domain resources occupied by PRACH resources configured in different first subframes are not completely the same, the third node sends a PRACH used by a random access sequence to occupy the same frequency domain resources on different first subframes.

Preferably, in the configuration period of the random access channel resource, multiple PRACH resources are configured in the same first subframe, and when frequency domain resources occupied by PRACH resources configured in different first subframes are not identical and the number of PRACH resources configured in different first subframes is not identical, the PRACH used by the third node to send the random access sequence occupies the same frequency domain resources on different first subframes.

Preferably, the first subframe is a subframe to which PRACH resources are allocated for the third node.

Preferably, when the indication information of the frequency hopping enabling of the random access channel resource allocated to the third node means frequency hopping enabling or default frequency hopping enabling of the random access channel allocated to the third node, the PRB resources occupied by the random access channel allocated to the third node in the first subframe within the predefined time window are the same, and the PRB resources occupied by the random access channel allocated to the third node in the first subframe between two consecutive predefined time windows are different.

Preferably, within the predefined time window, the random access channel allocated for the third node occupies the starting PRB resource,the calculation is obtained according to the following expression:

wherein,for the start PRB resource index,

is an offset amount of the PRB,

the total number of PRBs occupied for the uplink,

the number of PRBs occupied for one PRACH,

f_RAthe index of the PRACH resource, or the Frame index number, or the configuration period number of the PRACH, or the subframe number of the starting PRB of the PRACH resource,

k is a positive integer.

Preferably, the PRB resources of the random access channel allocated for the third node are separated by a predefined number of PRBs in the frequency domain between two consecutive predefined time windows.

Preferably, within the predefined time window, the random access channel allocated for the third node occupies the starting PRB resource,the calculation is obtained according to the following expression:

or

Wherein,

is an offset amount of the PRB,

f_RAthe index of the PRACH resource, or the Frame index number, or the configuration period number of the PRACH, or the subframe number of the starting PRB of the PRACH resource,

k is a positive integer and is a positive integer,

p is a positive integer and is a positive integer,

is the frequency hopping interval.

Preferably, within the predefined time window, when a plurality of PRACH is allocated to the third node in the first subframe, one PRACH is selected from the plurality of PRACH according to a predefined rule, and a random access sequence is sent on the selected PRACH.

Preferably, within the predefined time window, the frequency domain resources occupied by the PRACH selected in different first subframes are different.

Preferably, within the predefined time window, the frequency domain resources occupied by the PRACH selected in different first subframes are partially or entirely different.

Preferably, within the predefined time window, N first subframes select a PRACH with the same PRB resources, and two adjacent groups of N first subframes select PRACH resources according to a predefined rule, where N is a positive integer greater than or equal to 1.

Preferably, the predefined rules include at least one of:

indexes of PRACH selected by two adjacent groups of N first subframes are adjacent;

the difference value of PRB resources corresponding to PRACH selected by two adjacent groups of N first subframes on the frequency domain is maximum;

the difference value of PRB resources corresponding to PRACH selected by two adjacent groups of N first subframes on the frequency domain is minimum;

and the difference value of PRB resources corresponding to PRACH selected by two adjacent groups of N first subframes on the frequency domain is configured by the first node or configured by a system.

Preferably, when there are multiple frequency hopping patterns in the position of the PRB resource of the random access channel allocated to the third node in the first subframe, the used frequency hopping pattern is determined according to the frequency hopping pattern indication information of the random access channel resource allocated to the third node.

Preferably, when the meaning of the random access sequence hopping enabling indication information allocated to the third node is enabling, part or all of random access sequences transmitted by the third node in the first subframe in the predefined time window are different.

Preferably, within the predefined time window, the index of the random access sequence transmitted by the third node in the first subframe is determined by at least one of:

an index of the first subframe;

an index of a frame in which the first subframe is located;

an index of a configuration period of the random access channel resource where the first subframe is located;

a PRACH resource index used by the third node in the first subframe;

an index of a random access sequence selected by the third node.

Preferably, in the predefined time window, when there are multiple predefined rules for determining the index of the random access sequence transmitted by the third node in the first subframe, the predefined rule used is determined by the indication information of the random access sequence hopping rule allocated to the third node.

Preferably, when the meaning of the indication information of the jump of the random access sequence allocated to the third node is enable, the random access sequences allocated to the third node within the predefined time window are the same, and the random access sequences allocated to the third node between two consecutive predefined time windows are different.

Preferably, within the predefined time window, the index of the random access sequence transmitted by the third node is determined by at least one of:

an index of the first subframe;

an index of a frame in which the first subframe is located;

an index of a configuration period of the random access channel resource where the first subframe is located;

a PRACH resource index used by the third node in the first subframe;

an index of a random access sequence selected by the third node.

Preferably, the predefined time window refers to at least one of:

k1 subframes, K2 frames, K3 configuration periods of the random access channel resources,

wherein, K1, K2, and K3 are positive integers greater than or equal to 1, and values are configured by the first node or configured by a system.

Preferably, the second node is at least one of:

more than one terminal or terminal group;

more than one MTC terminal or MTC terminal group;

more than one M2M terminal or group of M2M terminals;

more than one device-to-device (D2D) terminal or group of D2D terminals.

Preferably, the system configuration refers to configuration by a standard or by a network higher layer.

Preferably, the first node is at least one of:

a Macro base station (Macro cell), a Micro base station (Micro cell), a Pico base station (Pico cell), a Femto base station (Femto cell), a home base station, a Low Power Node (LPN), and a Relay station (Relay).

The invention provides a random access sequence transmission method and a random access sequence transmission device.A first node sends a random access channel configuration message, wherein the random access channel configuration message at least comprises random access channel resource configuration information of a third node, so that higher MTC UE random access performance is realized, and the problem of ensuring that a random access signaling sent by the MTC UE in a severe environment can be correctly detected by an eNB is solved.

It will be understood by those of ordinary skill in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium and executed on a corresponding hardware platform (e.g., system, apparatus, device, etc.), and when executed, includes one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may be implemented by using an integrated circuit, and the steps may be respectively manufactured as an integrated circuit module, or a plurality of the blocks or steps may be manufactured as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The devices/functional modules/functional units in the above embodiments may be implemented by general-purpose computing devices, and they may be centralized on a single computing device or distributed on a network formed by a plurality of computing devices.

Each device/function module/function unit in the above embodiments may be implemented in the form of a software function module and may be stored in a computer-readable storage medium when being sold or used as a separate product. The computer readable storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc.

Any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all such changes or substitutions are included in the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (40)

1. A method for random access sequence transmission, comprising:

the first node sends a random access channel configuration message, wherein the random access channel configuration message at least comprises the random access channel resource configuration information of the third node.

2. The method of claim 1, wherein the random access channel resource configuration information comprises at least one of:

a configuration period of random access channel resources allocated to the third node;

indication information of frequency hopping enabling of random access channel resources allocated to the third node;

frequency hopping pattern indication information of random access channel resources allocated to the third node;

indication information of random access sequence hopping enabling distributed to the third node;

and indicating information of a random access sequence hopping rule allocated to the third node.

3. The method of random access sequence transmission according to claim 2, wherein the third node is a set of second nodes in one or more P (j, q), the method further comprising:

dividing the second nodes into J sets according to a first predefined rule, wherein each set is defined as P (J), J is more than or equal to 0 and less than or equal to J-1, and J is a positive integer more than or equal to 1;

dividing the second node in P (j) into Q (j) subsets according to a second predefined rule, wherein each subset defines P (j, q), Q (j) is the number of subsets to be divided in the set P (j), Q (j) is more than or equal to 1, and q is more than or equal to 0 and less than or equal to Q (j) -1.

4. The random access sequence transmission method of claim 3, wherein the first predefined rule is one of:

dividing the repeated sending times required by the second node for successfully decoding a Physical Broadcast Channel (PBCH) into J value intervals, and determining a set P (J) to which the second node should belong according to the interval in which the repeated times of the PBCH are located when the PBCH is successfully decoded by the second node;

dividing the repeated sending times required by the second node for successfully decoding a Main Information Block (MIB) into J value intervals, and determining a set P (J) to which the second node should belong according to the interval in which the repeated times of the MIB are located when the MIB is successfully decoded by the second node;

dividing the repeated sending times required by the second node for successfully decoding the System Information Block (SIB) into J value intervals, and determining a set P (J) to which the second node should belong according to the interval in which the repeated times of the SIB are located when the SIB is successfully decoded by the second node;

dividing the repeated sending times required by the second node for successfully decoding the Primary Synchronization Signal (PSS) into J value intervals, and determining a set P (J) to which the second node belongs according to the interval in which the repeated times of the PSS are located when the PSS is successfully decoded;

and dividing the repeated sending times required by the second node for successfully decoding the Secondary Synchronization Signal (SSS) into J value intervals, and determining a set P (J) to which the second node belongs according to the interval in which the repeated times of the SSS are positioned when the SSS is successfully decoded by the second node.

5. The random access sequence transmission method of claim 3, wherein the second predefined rule is:

dividing the signal quality of the predefined reference signal into Q (j) value intervals, measuring the signal quality of the reference signal by the second node in the set P (j), and determining the subset P (j, q) to which the second node should belong according to the interval in which the measured signal quality of the reference signal is located.

6. The random access sequence transmission method of claim 5, wherein the predefined reference signal is at least one of:

a reference signal dedicated to a sector in which the second node is located;

a reference signal dedicated to the second node;

PSS；

SSS；

the channel state indicates a reference signal (CSI-RS).

7. The method of random access sequence transmission according to claim 5, wherein the signal quality is at least one of:

reference Signal Received Power (RSRP);

a Reference Signal Received Quality (RSRQ);

a Received Signal Strength Indication (RSSI);

a path loss value between the second node and the first node;

a downlink signal-to-noise ratio of the second node;

an uplink signal-to-noise ratio of the second node.

8. The method according to claims 3 and 4, wherein the number of subsets Q (j) =1 in the set P (j) when the second node satisfies at least one of the following conditions: the number of repetitions of PBCH used when PBCH is successfully decoded by the second node in subset p (j) is greater than a predefined threshold;

when the second node in the subset p (j) successfully decodes the MIB, the number of repetitions of the MIB is larger than a predefined threshold;

when the second node in subset p (j) successfully decodes the SIB, the number of repetitions of the SIB is greater than a predefined threshold;

(ii) the number of repetitions of the PSS is greater than a predefined threshold value when the second node in subset p (j) successfully decodes the PSS;

when the second node in subset p (j) successfully decodes SSS, the number of repetitions of SSS is greater than a predefined threshold;

and when the second node in the subset P (j) successfully decodes the CSI-RS, the repetition number of the CSI-RS is larger than a predefined threshold value.

9. The method of claim 8, wherein the random access channel resource configuration information further comprises at least one of:

a threshold value of the number of repetitions of the PBCH;

a threshold value of the number of repetitions of the MIB;

a threshold value of the number of repetitions of the SIB;

a threshold value of the number of repetitions of the PSS;

a threshold value for a number of repetitions of the SSS;

a threshold value of the number of repetitions of the CSI-RS.

10. The method of claim 5, wherein the mapping relationship between the signal quality segment of the reference signal and the attributed subset P (j, q) is configured by the first node or by a system.

11. The random access sequence transmission method of claim 5, further comprising:

the second nodes in the subset P (j, q) adjust the transmit power when sending random access signalling.

12. The method of claim 11, wherein adjusting the transmission power at which the second nodes in the subset P (j, q) send random access signaling comprises at least one of:

after the second node in the subset P (j, q) sends a random access signaling and when a random access response message sent by the first node is not received, the second node increases the transmission power when the random access signaling is sent;

the transmission power at which the second node in the subset P (j, q) transmits random access signaling is not configured according to the maximum transmission power.

13. The method of claim 12, wherein the number of subsets q (j) in the set P (j) in which the subset P (j, q) is located is greater than 1.

14. The method of random access sequence transmission of claim 2, wherein the third node is one or more subsets of the second node.

15. The random access sequence transmission method of claim 14, wherein the second node is divided into S1 subsets according to a predefined rule, wherein S1 is a positive integer greater than or equal to 1, and wherein the predefined rule is at least one of:

dividing the coverage enhancement target value into S1 value intervals, and determining a subset to which the second node should belong according to the interval in which the coverage enhancement target value needs to be supported;

dividing the coverage enhancement target value of the random access channel into S1 value intervals, and determining a subset to which the second node should belong according to the interval in which the coverage enhancement target value of the random access channel needs to be supported is located;

dividing a coverage enhancement target value of the Msg1 message into S1 value intervals, and determining a subset to which the second node belongs according to the interval in which the coverage enhancement target value of the random access channel needs to be supported is located;

dividing the number of times that the Msg1 message needs to be sent repeatedly into S1 value intervals, and determining a subset to which the second node belongs according to the interval in which the number of times that the Msg1 message needs to be sent repeatedly needs to be supported;

dividing the number of times that the random access sequence needs to be repeatedly sent into S1 value intervals, and determining the subset to which the second node belongs according to the interval in which the number of times that the random access sequence needs to be repeatedly sent needs to be supported;

dividing the repetition times required by the second node when the Physical Broadcast Channel (PBCH) is successfully decoded into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the PBCH are located when the PBCH is successfully decoded by the second node;

dividing the repetition times required by the second node for successfully decoding the MIB into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the MIB are positioned when the second node successfully decodes the MIB;

dividing the repetition times required by the second node for successfully decoding the system information block SIB into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the SIB are located when the SIB is successfully decoded by the second node;

dividing the repetition times required by the second node for successfully decoding the primary synchronization signal PSS into S1 value intervals, and determining the sub-set to which the second node should belong according to the interval in which the repetition times of the PSS are located when the PSS is successfully decoded by the second node;

and dividing the repetition times required by the second node when successfully decoding the secondary synchronization signal SSS into S1 value intervals, and determining the subset to which the second node should belong according to the interval in which the repetition times of the SSS are positioned when successfully decoding the SSS.

16. The random access sequence transmission method of claim 2,

in the configuration period of the random access channel resource, a plurality of PRACH resources are configured in the same first subframe and the frequency domain resources occupied by the PRACH resources configured in different first subframes are the same, and the PRACH used by the third node to send the random access sequence occupies the same frequency domain resources on different first subframes.

17. The random access sequence transmission method of claim 2,

in the configuration period of the random access channel resource, when a plurality of PRACH resources are configured in the same first subframe and frequency domain resources occupied by the PRACH resources configured in different first subframes are not completely the same, the third node sends the PRACH used by the random access sequence to occupy the same frequency domain resources on different first subframes.

18. The random access sequence transmission method of claim 2,

in the configuration period of the random access channel resource, configuring a plurality of PRACH resources in the same first subframe, and when frequency domain resources occupied by the PRACH resources configured in different first subframes are not identical and the number of PRACH resources configured in different first subframes is not identical, the third node sends the PRACH used by the random access sequence to occupy the same frequency domain resources on different first subframes.

19. The method of claim 2, wherein the first subframe is a subframe in which PRACH resources are allocated for the third node.

20. The random access sequence transmission method of claim 2,

when the indication information of the frequency hopping enabling of the random access channel resource allocated to the third node means that the frequency hopping is enabled, or the frequency hopping is enabled by the default of the random access channel allocated to the third node, the PRB resources occupied by the random access channel allocated to the third node in the first subframe within the predefined time window are the same, and the PRB resources occupied by the random access channel allocated to the third node in the first subframe between two consecutive predefined time windows are different.

21. The random access sequence transmission method of claim 20,

starting PRB resources occupied by a random access channel allocated for a third node within the predefined time window,the calculation is obtained according to the following expression:

wherein,for the start PRB resource index,

is an offset amount of the PRB,

the total number of PRBs occupied for the uplink,

the number of PRBs occupied for one PRACH,

f_RAthe index of the PRACH resource, or the Frame index number, or the configuration period number of the PRACH, or the subframe number of the starting PRB of the PRACH resource,

k is a positive integer.

22. The random access sequence transmission method of claim 20,

the PRB resources of the random access channel allocated to the third node are separated by a predefined number of PRBs in the frequency domain between two consecutive predefined time windows.

23. The method of claim 20, wherein a random access channel allocated for a third node occupies a starting PRB resource within the predefined time window,the calculation is obtained according to the following expression:

or

Wherein,

is an offset amount of the PRB,

f_RAthe index of the PRACH resource, or the Frame index number, or the configuration period number of the PRACH, or the subframe number of the starting PRB of the PRACH resource,

k is a positive integer and is a positive integer,

p is a positive integer and is a positive integer,

is the frequency hopping interval.

24. The random access sequence transmission method of claim 20,

and when a plurality of PRACHs are allocated to the third node in the first subframe within the predefined time window, selecting one PRACH from the plurality of PRACHs according to a predefined rule, and sending a random access sequence on the selected PRACH.

25. The random access sequence transmission method of claim 24,

and within the predefined time window, the frequency domain resources occupied by the selected PRACH in different first subframes are different.

26. The method of claim 24, wherein the frequency domain resources occupied by the selected PRACH in different first subframes are partially or entirely different within the predefined time window.

27. The method of claim 24, wherein N first subframes select the PRACH with the same PRB resources within the predefined time window, and two adjacent groups of N first subframes select the PRACH resources according to a predefined rule, where N is a positive integer greater than or equal to 1.

28. The random access sequence transmission method of claim 27, wherein the predefined rule comprises at least one of:

indexes of PRACH selected by two adjacent groups of N first subframes are adjacent;

the difference value of PRB resources corresponding to PRACH selected by two adjacent groups of N first subframes on the frequency domain is maximum;

the difference value of PRB resources corresponding to PRACH selected by two adjacent groups of N first subframes on the frequency domain is minimum;

and the difference value of PRB resources corresponding to PRACH selected by two adjacent groups of N first subframes on the frequency domain is configured by the first node or configured by a system.

29. The random access sequence transmission method of claim 20,

and in the predefined time window, when the position of the PRB resource of the random access channel allocated to the third node in the first subframe has multiple frequency hopping patterns, determining the used frequency hopping pattern according to the frequency hopping pattern indication information of the random access channel resource allocated to the third node.

30. The random access sequence transmission method of claim 2,

when the meaning of the random access sequence hopping enabling indication information allocated to the third node is enabling, part or all of random access sequences sent by the third node in the first subframe in a predefined time window are different.

31. The method of claim 30, wherein the index of the random access sequence transmitted by the third node in the first subframe within the predefined time window is determined by at least one of:

an index of the first subframe;

an index of a frame in which the first subframe is located;

an index of a configuration period of the random access channel resource where the first subframe is located;

a PRACH resource index used by the third node in the first subframe;

an index of a random access sequence selected by the third node.

32. The random access sequence transmission method of claim 31,

and in the predefined time window, when the third node determines that the index of the random access sequence sent in the first subframe has multiple predefined rules, determining the used predefined rule through the random access sequence hopping rule indication information allocated to the third node.

33. The random access sequence transmission method of claim 2,

when the indication information of the jump enabling of the random access sequence allocated to the third node indicates enabling, the random access sequences allocated to the third node in the predefined time windows are the same, and the random access sequences allocated to the third node between two consecutive predefined time windows are different.

34. The method of claim 33, wherein the index of the random access sequence sent by the third node within the predefined time window is determined by at least one of:

an index of the first subframe;

an index of a frame in which the first subframe is located;

an index of a configuration period of the random access channel resource where the first subframe is located;

a PRACH resource index used by the third node in the first subframe;

an index of a random access sequence selected by the third node.

35. The random access sequence transmission method of any of claims 20 to 34, wherein the predefined time window refers to at least one of:

k1 subframes, K2 frames, K3 configuration periods of the random access channel resources,

wherein, K1, K2, and K3 are positive integers greater than or equal to 1, and values are configured by the first node or configured by a system.

36. The random access sequence transmission method of claim 3, wherein the second node is at least one of:

more than one terminal or terminal group;

more than one MTC terminal or MTC terminal group;

more than one M2M terminal or group of M2M terminals;

more than one device-to-device (D2D) terminal or group of D2D terminals.

37. The method of claim 1, wherein the system configuration refers to configuration by a standard or by a network higher layer.

38. The method of claim 1, wherein the first node is at least one of:

a Macro base station (Macro cell), a Micro base station (Micro cell), a Pico base station (Pico cell), a Femto base station (Femto cell), a home base station, a Low Power Node (LPN), and a Relay station (Relay).

39. An apparatus for random access sequence transmission, comprising:

and the configuration issuing module is used for sending a random access channel configuration message, wherein the random access channel configuration message at least comprises the random access channel resource configuration information of the third node.

40. The random access sequence transmitting device of claim 39, wherein the third node is a set of second nodes in one or more P (j, q), the device further comprising:

the resource management module is used for dividing the second node into J sets according to a first predefined rule, wherein each set is defined as P (J), J is more than or equal to 0 and less than or equal to J-1, J is a positive integer more than or equal to 1, the second node in P (J) is divided into Q (J) subsets according to a second predefined rule, each subset defines P (J, q), Q (J) is the number of the subsets needing to be divided in the set P (J), Q (J) is more than or equal to 1, and q is more than or equal to 0 and less than or equal to Q (J) -1.