CN115567153A

CN115567153A - Signal receiving method, signal sending method, signal receiving device, signal sending device and signal receiving equipment

Info

Publication number: CN115567153A
Application number: CN202110749440.7A
Authority: CN
Inventors: 柯颋; 柴丽; 刘玉真; 郑毅; 王飞; 李男
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2023-01-03
Anticipated expiration: 2041-07-02
Also published as: CN115567153B

Abstract

The invention provides a signal receiving method, a signal sending method, a signal receiving device, a signal sending device and signal receiving equipment, and relates to the technical field of communication. The method comprises the following steps: receiving a media access control unit, MAC CE; wherein, the MAC CE comprises a first indication domain and a second indication domain; the first indication field is used for indicating whether a parameter corresponding to first Downlink Control Information (DCI) changes; and the second indication domain is used for determining a new value of the parameter corresponding to the first DCI. The scheme of the invention can be suitable for the transmission requirement under multiple scenes, and avoids unnecessary signaling overhead.

Description

Signal receiving method, signal sending method, signal receiving device, signal sending device and signal receiving equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a signal receiving method, a signal sending method, a signal receiving device, a signal sending device, and a signal receiving apparatus.

Background

In the current communication system, 1 Medium Access Control (MAC) Protocol Data Unit (PDU) is composed of 1 or more MAC sub-PDUs. The MAC sub-pdu may include 1 MAC sub-header (sub) and 1 MAC Control Element (CE). Among them, an important function of the MAC CE includes: indicating or updating a value of a parameter corresponding to Downlink Control Information (DCI).

However, the existing MAC CE carries all values of the parameters corresponding to the DCI, and thus signaling overhead is large. Especially in a specific scenario, such as Non-terrestrial Network (NTN), there is a large spatial propagation delay, and the problem of long ambiguity period occurs when transmitting the MAC CE.

Disclosure of Invention

The invention aims to provide a signal receiving method, a signal sending method, a signal receiving device, a signal sending device and signal receiving equipment, which are suitable for transmission requirements in multiple scenes and avoid unnecessary signaling overhead.

To achieve the above object, an embodiment of the present invention provides a signal receiving method, executed by a terminal, including:

receiving a media access control unit, MAC CE;

wherein, the MAC CE comprises a first indication field and a second indication field;

the first indication field is used for indicating whether a parameter corresponding to first downlink control information DCI changes;

and the second indication domain is used for determining a new value of the parameter corresponding to the first DCI.

Optionally, the length of the first indication field is M1, and

when the ith bit of the first indication domain is a first value, indicating that a parameter corresponding to the jth code point in the first domain of the first DCI changes;

and/or when the ith bit of the first indication domain is a second value, indicating that the parameter corresponding to the jth code point in the first domain of the first DCI is unchanged;

wherein M1 is an integer greater than or equal to 1, i is an integer greater than or equal to 0, and j is an integer greater than or equal to 0.

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the length of the second indication field is M2, and M2 is equal to the number of bits in the first indication field whose value is equal to the first value.

Optionally, the terminal expects that the number of bits in the first indication field whose value is equal to the second value is greater than or equal to 1.

Optionally, after receiving the MAC CE, the method further includes:

updating a parameter set according to the first indication domain and the second indication domain of the MAC CE.

Optionally, the updating a parameter set according to the first indication field and the second indication field of the MAC CE includes:

under the condition that the ith bit of the first indication domain is the first value, determining a kth parameter value in the second indication domain according to the number k of the ith bit in all bits taking the value of the first indication domain as the first value;

updating target parameters in the parameter set according to the kth parameter value;

the target parameter corresponds to a jth code point in a first domain of the first DCI;

wherein k is an integer greater than or equal to 0.

Optionally, the updating the target parameter in the parameter set according to the kth parameter value includes:

updating the value of the target parameter in the parameter set to the kth parameter value; or,

and calculating to obtain a new parameter value based on the kth parameter value and the original parameter value in the parameter set, and updating the value of the target parameter in the parameter set to the new parameter value.

Optionally, the number of code points in the first domain of the first DCI is less than or equal to M1.

Optionally, after receiving the MAC CE, the method further includes:

applying the MAC CE in a target timeslot;

the target time slot is the first time slot after the time slot s + b, the terminal feeds back hybrid automatic repeat acknowledgement (HARQ-ACK) in the time slot s, the HARQ-ACK corresponds to a Physical Downlink Shared Channel (PDSCH) carrying the MAC CE, and b is a preset offset.

Optionally, before the target timeslot, an un-updated parameter set is valid; and/or

After the target time slot, the updated set of parameters is valid.

Optionally, after receiving the MAC CE, the method further includes:

acquiring a Logical Channel Identifier (LCID) in an MAC subheader of the MAC CE;

and determining the format of the MAC CE according to the LCID in the MAC subheader.

In order to achieve the above object, an embodiment of the present invention provides a signal sending method, executed by a network side device, including:

transmitting a medium access control element, MAC CE;

wherein, the MAC CE comprises a first indication domain and a second indication domain;

the first indication field is used for indicating whether a parameter corresponding to first Downlink Control Information (DCI) changes;

Optionally, the length of the first indication field is M1, and

wherein M1 is an integer greater than or equal to 1, i is an integer greater than or equal to 1, and j is an integer greater than or equal to 0.

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the number of bits in the first indication field whose value is equal to the second value is greater than or equal to 1.

Optionally, the method further comprises:

sending the first DCI before HARQ-ACK fed back by a terminal is received;

wherein a bit in the first indication field of the MAC CE corresponding to an object code point in the first field of the first DCI is the second value.

To achieve the above object, an embodiment of the present invention provides a signal receiving apparatus, including:

a receiving module, configured to receive a media access control unit MAC CE;

Optionally, the length of the first indication field is M1, and

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the length of the second indication field is M2, and M2 is equal to the number of bits whose value is equal to the first value in the first indication field.

Optionally, the apparatus further comprises:

a first processing module, configured to update a parameter set according to the first indication field and the second indication field of the MAC CE.

Optionally, the first processing module includes:

a determining submodule, configured to determine, in the second indication domain, a kth parameter value according to a number k of an ith bit in all bits, which take the value of the ith bit in the first indication domain as the first value, when the ith bit in the first indication domain is the first value;

the processing submodule is used for updating the target parameters in the parameter set according to the kth parameter value;

wherein k is an integer greater than or equal to 0.

Optionally, the processing sub-module is further configured to:

Optionally, the apparatus further comprises:

a second processing module, configured to apply the MAC CE in a target timeslot;

After the target time slot, the updated set of parameters is valid.

Optionally, the apparatus further comprises:

an obtaining module, configured to obtain a logical channel identifier LCID in an MAC subheader of the MAC CE;

and the determining module is used for determining the format of the MAC CE according to the LCID in the MAC subheader.

To achieve the above object, an embodiment of the present invention provides a signal transmission apparatus, including:

a sending module, configured to send a media access control unit MAC CE;

Optionally, the length of the first indication field is M1, and

and/or when the ith bit of the first indication domain is a second value, indicating that the parameter corresponding to the jth code point in the first domain of the first DCI is not changed;

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the apparatus further comprises:

a DCI sending module, configured to send the first DCI before receiving a HARQ-ACK fed back by a terminal;

To achieve the above object, an embodiment of the present invention provides a terminal, including a transceiver, where the transceiver is configured to:

receiving a media access control unit, MAC CE;

Optionally, the length of the first indication field is M1, and

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the terminal further comprises a processor, the processor is configured to:

Optionally, the processor is further configured to:

wherein k is an integer greater than or equal to 0.

Optionally, the processor is further configured to:

applying the MAC CE in a target time slot;

Or,

before the target timeslot, an un-updated parameter set is valid; and/or

After the target time slot, the updated set of parameters is valid.

Optionally, the processor is further configured to:

To achieve the above object, an embodiment of the present invention provides a network side device, including a transceiver, configured to:

transmitting a medium access control element, MAC CE;

Optionally, the length of the first indication field is M1, and

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the transceiver is further configured to:

sending the first DCI before receiving HARQ-ACK fed back by a terminal;

To achieve the above object, an embodiment of the present invention provides a communication device, including a transceiver, a processor, a memory, and a program or instructions stored on the memory and executable on the processor; the processor, when executing the program or instructions, implements a signal receiving method as described above, or a signal transmitting method as described above.

To achieve the above object, an embodiment of the present invention provides a readable storage medium on which a program or instructions are stored, which when executed by a processor implement the signal receiving method as described above, or the signal transmitting method as described above.

The technical scheme of the invention has the following beneficial effects:

in the embodiment of the present invention, the MAC CE received by the terminal includes a first indication field for indicating whether the parameter corresponding to the first DCI changes and a second indication field for determining a new value of the parameter corresponding to the first DCI, and the MAC CE can flexibly indicate the change of the parameter of the DCI, thereby avoiding unnecessary signaling overhead.

Drawings

Fig. 1 is a flowchart of a signal receiving method according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a MAC CE format according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating a conventional MAC CE format;

FIG. 4 is a diagram of MAC CE transmission;

fig. 5 is a flowchart of a signal transmission method according to an embodiment of the present invention;

fig. 6 is a block diagram of a signal receiving apparatus according to an embodiment of the present invention;

fig. 7 is a structural diagram of a signal transmission apparatus according to an embodiment of the present invention;

fig. 8 is a structural diagram of a terminal of an embodiment of the present invention;

fig. 9 is a block diagram of a communication device according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic of the process, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

In addition, the terms "system" and "network" are often used interchangeably herein.

In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

As shown in fig. 1, a signal receiving method according to an embodiment of the present invention is executed by a terminal, and includes:

step 101, receiving a media access control unit (MAC CE);

In this way, the MAC CE received by the terminal includes the first indication field for indicating whether the parameter corresponding to the first downlink control information DCI changes and the second indication field for determining the new value of the parameter corresponding to the first DCI, and the MAC CE can flexibly indicate the change of the parameter of the DCI, thereby avoiding unnecessary signaling overhead.

The parameter corresponding to the first DCI is a parameter corresponding to a code point in a specific domain (for example, the first domain) of the first DCI.

Optionally, the length of the first indication field is M1, and

Assuming that the first value is equal to 1, when the ith bit of the first indication field is 1, the parameter corresponding to the jth code point in the first field of the first DCI is indicated to be changed. And if the second value is equal to 0, indicating that the parameter corresponding to the jth code point in the first domain of the first DCI has not changed when the ith bit of the first indication domain is 0.

Where i is associated with j. Optionally, j is equal to the sum of i and a preset parameter p, and p is an integer.

That is, if i =1, j = i + p =1+p. p is a preset integer, such as 0,1.

For example, the MAC CE shown in FIG. 2, the first indication field C ₀ ～C _M1-1 And indicating that the parameter corresponding to the associated code point in the first domain of the first DCI changes by taking the value as 0 or 1. In particular, if C ₀ (i.e., i = 0) is 1, the parameter corresponding to the p-th (i.e., j = 0+p) code point in the first domain of the first DCI changes. If C _i If (i =0,1., M1-1) is 1, the parameters corresponding to the j = i + p code points in the first domain of the first DCI change.

Thus, M2 is less than or equal to M1.

In one embodiment, the MAC CE is used to update a Transmission Configuration Indication (TCI) state set. Thus, if Radio Resource Control (RRC) configures N Transmission Configuration Indicator (TCI) states, each TCI state is numbered TCI-StateId i, i =0,1. A Transmission Configuration Indication field (Transmission Configuration Indication field) of Downlink Control Information (DCI) may indicate M1 code points (codepoint), i.e., a value range of codepoint value is 0,1, …, M1-1. In contrast to the MAC CE including N (128) bits (N TCI states are in one-to-one correspondence) as shown in fig. 3, the MAC CE of the embodiment of the present application, as shown in fig. 2, includes M1+ M2 · log ₂ (N) bit. Assuming N =128 and M1 equals 8, if M2=4 (i.e. assuming that only half of the TCI states in the MAC CE have changed), the signaling overhead required by the MAC CE needs only 36 bits.

Optionally, in this embodiment, the terminal expects that the number of bits in the first indication field whose value is equal to the second value is greater than or equal to 1.

It can also be understood that the terminal does not expect the number of bits in the first indicator field whose value is equal to the second value to be equal to 0.

The physical meaning is: the terminal expects that partial information in the information carried in the MAC CE is not updated; that is, the terminal does not expect all the information carried in the MAC CE to be changed.

Optionally, in this embodiment, after receiving the MAC CE, the method further includes:

That is, after receiving the MAC CE including the first indication field and the second indication field, the terminal can update the parameter set based on the first indication field and the second indication field.

Here, the parameter set is a set of parameters corresponding to each code point in the first domain of the first DCI. Such as the above example of a TCI state set of N TCI states of the RRC configuration.

wherein k is an integer greater than or equal to 0.

Thus, after receiving the MAC CE, the number k of the ith bit taking the value as the first value in the first indication field of the MAC CE is determined in the second indication field, and then the target parameter in the parameter set is updated by the kth parameter value. Here, the target parameter is corresponding to the jth code point in the first domain of the first DCI, of course, j is associated with i, e.g., j = i + p.

The number k of the ith bit in the first indication field is the number of all bits of which the value is the first value in the first indication field, and the number is obtained by sequencing in sequence. It is assumed that the first indication field comprises 8 bits, in particular C ₀ (0 th bit), C ₁ (1 st bit), …, C ₇ (7 th bit) in which only C is present ₀ 、C ₃ And C ₆ Is a first value. In the process of mixing C ₀ 、C ₃ And C ₆ After sequencing, the corresponding numbers are 0,1 and 2. Therefore, if i =0, k =0, the target parameter corresponding to the p-th code point (j = i + p = p) in the first domain of the first DCI is updated based on the 0-th (k = 0) parameter value in the second indication domain; if i =3, k =1, updating target parameters corresponding to 3+p code points (j = i + p = 3+p) in the first domain of the first DCI based on the 1 st (k = 1) parameter value in the second indication domain; if i =6, k =2, the target parameter corresponding to 6+p code points (j = i + p = 6+p) in the first domain of the first DCI is updated based on the 2 nd (k = 2) parameter value in the second indication domain.

Optionally, in this embodiment, the updating, according to the kth parameter value, a target parameter in the parameter set includes:

Here, for updating of the parameter set, based on the obtained kth parameter value, in an embodiment, the value of the corresponding target parameter may be directly updated to the kth parameter value, that is, the new value of the target parameter = the kth parameter value; in another embodiment, a new parameter value is obtained by calculating the kth parameter value and the original parameter value, and then the value of the corresponding target parameter is updated to the new calculated parameter value, that is, the new value = f of the target parameter (the old value of the target parameter, the kth parameter value).

The calculation of the kth parameter value and the original parameter value is performed according to a preset rule, that is, the new parameter value = f (original parameter value, kth parameter value), and f () is a function. Specifically, if f (original parameter value, k parameter value) = original parameter value + k parameter value, the new parameter value = original parameter value + k parameter value.

As described above, in this embodiment, all target parameters corresponding to all bits whose values are the first value in the first indication field in the parameter set can be updated.

Optionally, in this embodiment, the number of code points in the first domain of the first DCI is less than or equal to M1.

In one embodiment, M1=8, the first field of the first DCI has 3 bits.

In one configuration, the first field of the first DCI has 8 (2) ³ ) A code point, exactly equal to the length M1=8 of the first indication field in the MAC CE. At this time, each code point in the first domain of the first DCI corresponds to each bit of the first indication domain in the MAC CE one-to-one.

In another configuration, the first field of the first DCI has only 7 code points (e.g., j =1,2,. 7) in one-to-one correspondence with 7 bits (e.g., i =0,1, …, 6) of the first indication field in the MAC CE. A certain value state (such as j = 0) of a first domain of the first DCI is reserved for special use and is not associated with a first indication domain in the MAC CE; correspondingly, a bit (e.g., i = 7) in the first indication field in the MAC CE is also reserved correspondingly.

In addition, in this embodiment, optionally, after step 101, the method further includes:

applying the MAC CE in a target timeslot;

Therefore, for the received MAC CE, the MAC CE is applied at the first slot after the target slot (i.e., the slot s + the preset offset b where the terminal feeds back the HARQ-ACK). Of course, the HARQ-ACK fed back by the terminal corresponds to the PDSCH carrying the MAC CE.

Alternatively, the preset offset b may be equal to

Indicating the number of slots in a subframe at the configured subcarrier spacing μ.

After the target time slot, the updated set of parameters is valid.

That is, the original set of parameters is still used before the target timeslot. And after the target time slot, a new set of parameters may be employed.

Thus, as shown in fig. 4, a DL slot n on the gbb side (corresponding to a GNSS time t) is provided for the base station (gbb) ₁ ) And transmitting the PDSCH carrying the MAC CE. Terminal (UE) DL time slot n on UE side (corresponding to GNSS time t) ₂ ) Receiving the PDSCH carrying the MAC CE, and performing spatial propagation delay tau _delay ＝t ₂ -t ₁ I.e. t ₂ ＝t ₁ +τ _delay . UE UL time slot m on UE side (corresponding to GNSS time t) ₃ ) Wherein m = n + K _offset +K ₁ And sending HARQ-ACK feedback aiming at the PDSCH carrying the MAC CE, wherein the timing parameter K _offset And K ₁ Configured by higher layers and/or DCI. The timing boundary of UL slot n on the UE side has a length TA (T) relative to the timing boundary of DL slot n on the UE side _TA ) Timing advance of (2). Viewed from the UE side, the UL time slot on the UE side

(corresponding to GNSS time t ₄ ) The first slot thereafter, the MAC CE takes effect. UE UL time slot m on UE side (corresponding to GNSS time t) ₃ ) Transmitted HARQ-ACK feedback is delayed by spatial propagation (τ) _delay ) At GNSS time t ₅ To the base station side. Wherein,

one hourThe slot corresponds to 1ms, thus t ₄ ＝t ₃ +3，t ₅ ＝t ₃ +τ _delay 。

When the base station is in GNSS t ₅ When HARQ-ACK feedback sent by UE is received, t can be determined when the UE is in GNSS ₁ Whether the transmitted MAC CE is in effect.

In particular, t when the base station is in GNSS ₅ And when the ACK feedback is received, determining that the MAC CE is effective. Otherwise, t when the base station is in GNSS ₅ And when the HARQ-ACK fed back by the UE is not received or the base station receives NACK feedback, the MAC CE is considered not to be effective.

Possible reasons for the failure of the MAC CE to take effect include: the DCI which is sent by the base station and used for scheduling the PDSCH transmission carrying the MAC CE command is not correctly received by the UE (no HARQ-ACK feedback), the DCI is correctly received but the PDSCH scheduled by the DCI is not correctly decoded (UE feeds back NACK), and the DCI is correctly received but the HARQ-ACK fed back by the UE is missed on the side of the base station (the base station does not receive the HARQ-ACK feedback sent by the UE).

As shown in FIG. 4, according to the existing protocol, if everything is successful (UE correctly receives DCI, decodes PDSCH), then the UE is t at GNSS time ₄ Confirming that the MAC CE is in effect.

Thus, the gNB can confirm the GNSS time t from which the PDSCH carrying the MAC CE is transmitted ₁ T until UE determines GNSS time at which MAC CE is in effect ₄ Time interval T in between ₁ In this case, the MAC CE must not be validated.

T ₁ ＝t ₄ -t ₁ ＝t ₃ +3-t ₁ ＝t ₂ -T _TA +(K _offset +K ₁ )·2 ^-μ +3-t ₁ ＝(K _offset ·2 ^-μ -T _TA )+τ _delay +K ₁ ·2 ^-μ +3

On the other hand, t when the UE determines the GNSS with the MAC CE in effect ₄ GNSS time t of HARQ-ACK (hybrid automatic repeat request-acknowledgement) fed back by UE (user equipment) possibly received by base station ₅ Time interval T in between ₂ In this case, the base station cannot determine whether the MAC CE is valid. At this time, the time interval T can be set ₂ Referred to as blur period, i.e. at T ₂ During this time, the base station and the UE cannot agree on an understanding of whether the MAC CE is in effect.

T ₂ ＝t ₅ -t ₄ ＝(t ₃ +τ _delay )-(t ₃ +3)＝τ _delay -3

Propagation delay tau between UE and base station in terrestrial network _delay Very small (e.g., 350m inter-site distance for dense urban areas,

)，T ₁ < 0, so there is no ambiguity period problem for MAC CE to take effect.

And in the NTN network, the propagation delay tau between the UE and the base station _delay Is very large. For example, for a GEO satellite employing a transparent forwarding architecture, τ _delay 272.37ms. At this time, the maximum fuzzy period of the effective MAC CE can reach T ₂ ＝τ _delay -3≈269.37ms。

In order to solve the problem of an excessively long fuzzy period in the MAC CE updating operation in the NTN scenario, optionally, as a base station side implementation technique, the base station updates only part of parameters of the parameter set each time; and in the ambiguity period, the DCI only indicates the unchanged parameters in the parameter set.

For example, the parameter set represents the currently active TCI state, and the original parameter set includes TCI-0, TCI-1, TCI-2, and TCI-3. The base station updates only part of the parameters at a time, and the updated parameter set comprises TCI-0, TCI-1, TCI-5 and TCI-6.

Before the base station correctly receives the HARQ-ACK fed back by the UE (i.e. t at GNSS time in FIG. 4) ₅ Before), the code point of the first domain in the DCI only corresponds to the parameters which are not updated in the parameter set, namely, the code point of the first domain in the DCI respectively corresponds to TCI-0 and TCI-1; after the base station correctly receives the HARQ-ACK fed back by the UE (i.e. t at GNSS time in FIG. 4) ₅ Thereafter), the code point of the first domain in the DCI includes the code point of the updated parameter in the corresponding parameter set. In this way, ambiguity of parameter sets at the network side and the terminal side in the fuzzy period is avoided.

And the terminal expects that the number of bits with the value equal to the second value in the first indication domain is more than or equal to 1 corresponding to the behavior of the partial update parameter of the base station. It can also be understood that the terminal does not expect the number of bits in the first indicator field whose value is equal to the second value to be equal to 0.

The physical meaning is: the terminal expects that some parameters in the parameter set are not updated; that is, the terminal does not expect all of the parameters in the parameter set to be changed.

Optionally, in this embodiment, after step 101, the method further includes:

That is, after receiving the MAC CE, the terminal recognizes the format of the MAC CE based on the LCID in the MAC header of the MAC CE, thereby knowing the information contents of the first indication field and the second indication field.

It should be appreciated that, based on existing protocols, certain values of LCID have corresponding meanings, as shown in the following table:

it can be seen that the MAC CE format described in this case is different from any existing MAC CE format. For differentiation, the LCID value of the MAC CE format described in this disclosure may be a value from 35 to 46 (that is, the LCID of a reserved value is used to indicate the MAC CE format described in this disclosure). That is, when the LCID value is any one of 35 to 46, it indicates that the MAC CE is the MAC CE having the first indication field and the second indication field in this embodiment.

In summary, in the signal receiving method according to the embodiment of the present invention, the MAC CE received by the terminal includes the first indication field for indicating whether the parameter corresponding to the first DCI changes and the second indication field for determining the new value of the parameter corresponding to the first DCI, and the MAC CE can flexibly indicate the change of the parameter of the DCI, so as to avoid unnecessary signaling overhead.

As shown in fig. 5, a signal sending method according to an embodiment of the present invention is executed by a network side device, and includes:

step 501, transmitting a media access control unit (MAC CE);

In this way, the MAC CE sent by the network side device includes the first indication field for indicating whether the parameter corresponding to the first DCI changes and the second indication field for determining the new value of the parameter corresponding to the first DCI, and the MAC CE can flexibly indicate the change of the parameter of the DCI, thereby avoiding unnecessary signaling overhead.

Optionally, the length of the first indication field is M1, and

Optionally, j is equal to the sum of i and a preset parameter p.

In this embodiment, as shown in fig. 4, DL slot n on the gbb side for the gbb (corresponding to GNSS time t) ₁ ) And transmitting the PDSCH carrying the MAC CE. DL time slot n (corresponding to GNSS) of UE on UE sideTime t ₂ ) Receiving the PDSCH carrying the MAC CE, and performing spatial propagation delay tau _delay ＝t ₂ -t ₁ I.e. t ₂ ＝t ₁ +τ _delay . UE UL time slot m on UE side (corresponding to GNSS time t) ₃ ) Wherein m = n + K _offset +K ₁ And sending HARQ-ACK feedback aiming at the PDSCH carrying the MAC CE, wherein the timing parameter K _offset And K ₁ By higher layer and/or DCI configuration. The timing boundary of UL slot n on the UE side has a length TA (T) relative to the timing boundary of DL slot n on the UE side _TA ) Timing advance of (2). Viewed from the UE side, the UL time slot on the UE side

one slot corresponds to 1ms, so t ₄ ＝t ₃ +3，t ₅ ＝t ₃ +τ _delay 。

According to the existing protocol, if everything is successful (UE correctly receives DCI, decodes PDSCH), then the UE is in GNSS t ₄ Confirming that the MAC CE is in effect.

Thus, the gNB can confirm the GNSS time t from which the PDSCH carrying the MAC CE was transmitted ₁ T until UE determines GNSS time at which MAC CE is in effect ₄ Time interval T in between ₁ In this case, the MAC CE must not be validated.

Propagation delay tau between UE and base station in NTN network _delay Is very large. For example, for a GEO satellite employing a transparent forwarding architecture, τ _delay 272.37ms. At this time, the maximum ambiguity period for the MAC CE to take effect can reach T ₂ ＝τ _delay -3≈269.37ms。

In order to solve the problem of the long ambiguity period in the MAC CE update operation in the NTN scenario described above,

optionally, the method further comprises:

sending the first DCI before HARQ-ACK fed back by a terminal is received;

Here, HARQ-ACK fed back by the terminal corresponds to PDSCH carrying MAC CE. The target code point is denoted as a first code point and is a code point corresponding to a bit in the first indication field of the MAC CE that is equal to the second value. In this way, before the network side device receives the HARQ-ACK, the transmitted first DCI includes only the first code point, and corresponds to an index of an unchanging parameter (unchanged parameter) in the parameter set, where the unchanging parameter in the parameter set is a parameter corresponding to a bit in the first indication field of the MAC CE, where the bit is equal to the second value.

Of course, after the network side device correctly receives the HARQ-ACK, the first DCI transmitted includes a code point that can correspond to an index of a parameter (changed parameter) that is changed in the parameter set, that is, the second code point. The changed parameter in the parameter set is the parameter corresponding to the bit equal to the first value in the first indication field of the MAC CE.

Optionally, in this embodiment, the network side device sends the first DCI in the first time period before receiving the HARQ-ACK, where the bit of the first DCI in the first domain corresponding to the target code point is the second value in the first indication domain of the MAC CE.

Optionally, the first time period is at least between a time 1 when the terminal transmits the HARQ-ACK and a time 2 when the terminal receives the HARQ-ACK, that is, within the ambiguity period.

With reference to FIG. 4, the first time period T ≧ T ₅ -t ₄ ，

In general, the base station cannot know exactly τ of per UE _delay Size. However, the base station can determine τ based on the coverage area (e.g., a satellite beam) to which the UE belongs _delay Maximum value of

In addition, the network may be configurable

Namely, it is

Therefore, the first time interval T may adopt any one of the following configurations;

T＝τ _delay -C

wherein C represents a predetermined value. For example, when the number of the slots is a unit,

or when

Each slot corresponds to 1ms, c =3ms.

That is, the network side device indicates only the unchanged parameters in the parameter set by the DCI during the ambiguity period.

Before the base station correctly receives the HARQ-ACK fed back by the UE (i.e. t at GNSS time in FIG. 4) ₅ Before), the code point of the first domain in the DCI only corresponds to the parameters which are not updated in the parameter set, namely, the code point of the first domain in the DCI respectively corresponds to TCI-0 and TCI-1; after the base station correctly receives the HARQ-ACK fed back by the UE (i.e. t at GNSS time in FIG. 4) ₅ Thereafter), the code point of the first domain in the DCI includes the code point of the updated parameter in the corresponding parameter set. In this way, ambiguity of the parameter sets at the network side and the terminal side during the ambiguity period is avoided.

And corresponding to the action of partly updating the MAC CE parameter by the base station, the terminal expects that the number of bits with the value equal to the second value in the first indication field is more than or equal to 1. It can also be understood that the terminal does not expect the number of bits in the first indicator field whose value is equal to the second value to be equal to 0.

The physical meaning is: the terminal expects that part of parameters in the parameter set are not updated; that is, the terminal does not expect all of the parameters in the parameter set to be changed.

It should be noted that the method of this embodiment is implemented in cooperation with the signal receiving method executed by the terminal, and the implementation manner of the embodiment of the method is applicable to this method, and the same technical effect can be achieved.

As shown in fig. 6, a signal receiving apparatus according to an embodiment of the present invention includes:

a receiving module 610, configured to receive a media access control unit MAC CE;

Optionally, the length of the first indication field is M1, and

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the apparatus further comprises:

Optionally, the first processing module includes:

wherein k is an integer greater than or equal to 0.

Optionally, the processing sub-module is further configured to:

Optionally, the apparatus further comprises:

After the target time slot, the updated set of parameters is valid.

Optionally, the apparatus further comprises:

The MAC CE received by the apparatus includes a first indication field for indicating whether the parameter corresponding to the first DCI changes and a second indication field for determining a new value of the parameter corresponding to the first DCI, and the MAC CE can flexibly indicate the change of the parameter of the DCI, thereby avoiding unnecessary signaling overhead.

It should be noted that, the apparatus applies the signal receiving method executed by the terminal, and the implementation manner of the embodiment of the method is applicable to the apparatus, and the same technical effect can be achieved.

As shown in fig. 7, a signal transmission apparatus according to an embodiment of the present invention includes:

a transmitting module 710, configured to transmit a medium access control unit MAC CE;

Optionally, the length of the first indication field is M1, and

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the apparatus further comprises:

The MAC CE sent by the device comprises a first indication field used for indicating whether the parameter corresponding to the first DCI changes or not and a second indication field used for determining a new value of the parameter corresponding to the first DCI, and can flexibly indicate the change of the parameter of the DCI, thereby avoiding unnecessary signaling overhead.

It should be noted that, the apparatus applies the signal receiving method executed by the network side device, and the implementation manner of the embodiment of the method is applicable to the apparatus, and the same technical effect can be achieved.

As shown in fig. 8, a terminal 800 according to an embodiment of the invention includes a processor 810 and a transceiver 820.

The transceiver is to: receiving a media access control unit, MAC CE;

Optionally, the length of the first indication field is M1, and

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the processor is configured to:

and updating a parameter set according to the first indication domain and the second indication domain of the MAC CE.

Optionally, the processor is further configured to:

wherein k is an integer greater than or equal to 0.

Optionally, the processor is further configured to:

applying the MAC CE in a target timeslot;

After the target time slot, the updated set of parameters is valid.

Optionally, the processor is further configured to:

The terminal in this embodiment, the received MAC CE includes a first indication field for indicating whether a parameter corresponding to the first DCI changes and a second indication field for determining a new value of the parameter corresponding to the first DCI, and the MAC CE can flexibly indicate the change of the parameter of the DCI, thereby avoiding unnecessary signaling overhead.

The network side device of the embodiment of the invention comprises a transceiver, wherein the transceiver is used for:

transmitting a medium access control element, MAC CE;

Optionally, the length of the first indication field is M1, and

Optionally, j is equal to the sum of i and a preset parameter p.

Optionally, the transceiver is further configured to:

sending the first DCI before receiving HARQ-ACK fed back by a terminal;

The MAC CE sent by the network side device includes a first indication field for indicating whether a parameter corresponding to the first DCI changes and a second indication field for determining a new value of the parameter corresponding to the first DCI, and the MAC CE can flexibly indicate the change of the parameter of the DCI to avoid unnecessary signaling overhead.

A communication device according to another embodiment of the present invention, as shown in fig. 9, includes a transceiver 910, a processor 900, a memory 920, and a program or instructions stored in the memory 920 and executable on the processor 900; the processor 900 implements the above-mentioned signal receiving method or signal transmitting method when executing the program or the instructions.

The transceiver 910 is used for receiving and transmitting data under the control of the processor 900.

In fig. 9, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 900, and various circuits, represented by memory 920, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 910 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 may store data used by the processor 900 in performing operations.

The readable storage medium of the embodiment of the present invention stores a program or an instruction thereon, and the program or the instruction when executed by the processor implements the signal receiving method or the steps in the signal sending method as described above, and can achieve the same technical effects, and the details are not repeated here in order to avoid repetition.

Wherein, the processor is the processor in the communication device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It is further noted that the terminals described in this specification include, but are not limited to, smart phones, tablets, etc., and that many of the functional components described are referred to as modules in order to more particularly emphasize their implementation independence.

In embodiments of the present invention, modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Similarly, operational data may be identified within modules, and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.

When a module can be implemented by software, considering the level of hardware technology, a module implemented in software may build a corresponding hardware circuit to implement corresponding functions, without considering the cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

The exemplary embodiments described above are described with reference to the drawings, and many different forms and embodiments of the invention may be made without departing from the spirit and teaching of the invention, therefore, the invention is not to be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of components may be exaggerated for clarity. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Unless otherwise indicated, a range of values, when stated, includes the upper and lower limits of the range and any subranges therebetween.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A signal receiving method, performed by a terminal, comprising:

receiving a media access control unit, MAC CE;

2. The method of claim 1, wherein the first indication field has a length of M1, and wherein

3. The method according to claim 2, characterized in that j is equal to the sum of i and a preset parameter p, p being an integer.

4. The method of claim 2, wherein the second indication field has a length of M2, and wherein M2 is equal to the number of bits in the first indication field that take a value equal to the first value.

5. The method of claim 2,

the terminal expects that the number of bits in the first indication field whose value is equal to the second value is greater than or equal to 1.

6. The method of claim 2, wherein after receiving the media access control element (MAC CE), further comprising:

7. The method of claim 6, wherein the updating the set of parameters according to the first indication field and the second indication field of the MAC CE comprises:

wherein k is an integer greater than or equal to 0.

8. The method of claim 7, wherein the updating the target parameter in the parameter set according to the kth parameter value comprises:

9. The method of claim 2, wherein a number of code points in a first domain of the first DCI is less than or equal to M1.

10. The method of claim 1, wherein after receiving the MAC CE, the method further comprises:

applying the MAC CE in a target timeslot;

11. The method of claim 10,

before the target timeslot, an un-updated parameter set is valid; and/or

After the target time slot, the updated set of parameters is valid.

12. The method of claim 1, wherein after receiving the MAC CE, the method further comprises:

13. A signal transmission method, performed by a network side device, includes:

transmitting a medium access control element, MAC CE;

14. The method of claim 13, wherein the first indication field has a length of M1, and wherein

15. The method according to claim 14, wherein j is equal to the sum of i and a preset parameter p.

16. The method of claim 14, wherein the second indication field has a length of M2, and wherein M2 is equal to the number of bits in the first indication field that take a value equal to the first value.

17. The method of claim 14, wherein the number of bits in the first indication field whose value is equal to the second value is greater than or equal to 1.

18. The method of claim 14, further comprising:

sending the first DCI before receiving HARQ-ACK fed back by a terminal;

19. The method of claim 16, wherein a number of code points in a first domain of the first DCI is less than or equal to the M1.

20. A signal receiving apparatus, comprising:

a receiving module, configured to receive a media access control unit MAC CE;

21. A signal transmission device, comprising:

a sending module, configured to send a media access control unit MAC CE;

22. A terminal, comprising a transceiver configured to:

receiving a media access control unit, MAC CE;

23. A network-side device, comprising a transceiver configured to:

transmitting a medium access control element, MAC CE;

24. A communication device, comprising: a transceiver, a processor, a memory, and a program or instructions stored on the memory and executable on the processor; characterized in that the processor, when executing the program or instructions, implements a signal receiving method according to any one of claims 1 to 12 or a signal transmitting method according to any one of claims 13 to 19.

25. A readable storage medium on which a program or instructions are stored, which program or instructions, when executed by a processor, implement a signal receiving method as claimed in any one of claims 1 to 12, or a signal transmitting method as claimed in any one of claims 13 to 19.