CN107113125B - Method and device for transmitting broadcast message - Google Patents
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Abstract
The embodiment of the invention provides a method and a device for transmitting a broadcast message, relates to the field of communication, and solves the problems of communication speed reduction and time-frequency resource waste caused by reserved time slot intervals. The scheme comprises the following steps: the first UE determines the time-frequency resource information of the first UE in the No. 0 frame according to the current system frame number T and the time-frequency resource information used by at least one other UE before the T frame; the first UE determines the frequency domain resource position of the first UE in the frame T according to the current system frame number T and the frequency domain resource position of the first UE in the frame 0; the first UE determines the time slot group position and the time slot position of the first UE in the frame T according to the current system frame number T and the time-frequency resource information of the first UE in the frame 0, and determines the time domain resource position of the first UE in the frame T; and the first UE sends the broadcast message of the first UE by using the resources of the frequency domain resource position and the time domain resource position of the frame T.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting a broadcast message.
Background
The Frequency-Hopping Spread Spectrum (FHSS) is a common communication means in the communication field, which can effectively avoid interference and exert communication efficiency.
Specifically, the channel resources may be divided into time domain resources and frequency domain resources, as shown in fig. 1, in each frame, the frequency domain resources may be divided into m subcarriers in the frequency domain direction, the time domain resources may be divided into N time slots in the time domain direction, and a time slot interval of a certain duration is set between the time slots, so that m × N time frequency resources may be obtained in one frame, and assuming that a cycle in which the UE communicates with the base station includes N frames, then m × N time frequency resource sequences may be obtained, for example, the first time frequency resource in the frame 0, the first time frequency resource in the frame 1, and the first time frequency resource in the frame N-1 are one time frequency resource sequence.
In the prior art, in order to solve the half-duplex problem (i.e., different UEs using the same time domain resource cannot communicate with each other) existing when a D2D (Device-to-Device) Device performs broadcast communication by using FDM (frequency division Multiplexing), the following frequency hopping scheme may be used to reasonably allocate time-frequency resources:
i(0)＝0，1，...，m-1，j(0)＝0，1，...，n-1；
i(t)＝i(0)，j(t)＝j(0)+i(0)*t mod n；
as shown in fig. 1, i (0) is the frequency domain resource location of an arbitrary UE in frame 0, j (0) is the time domain resource location of the UE in frame 0, i (T) is the frequency domain resource location of the UE in frame T, and j (T) is the time domain resource location of the UE in frame T, that is, the frequency-time resource used by the UE in frame T is determined by the frequency-time resource in frame 0.
Based on this specific broadcast communication method, two UEs using different time-frequency resources in each period (N frames) have the same time-domain position (i.e. j (t)) in at most one frame, which ensures that two UEs using different time-frequency resources can communicate at least in other N-1 frames, as shown in fig. 1, two UEs using the first time-frequency resource and the fourth time-frequency resource are located in the same time slot only in frame No. 0.
However, since a time slot interval with a certain duration is reserved between time slots, when two UEs using adjacent time domain resources transmit and receive data, the data can be transmitted and received only after waiting for the duration of the time slot interval, and especially when the duration of one time slot is short, which causes an increase in the occupation ratio of the time slot interval, the communication speed of the UEs is increased to a great extent, and time-frequency resources are wasted.
Disclosure of Invention
Embodiments of the present invention provide a method and an apparatus for transmitting a broadcast message, which solve the problems of communication speed reduction and time-frequency resource waste caused by a reserved time slot interval when a UE performs frequency hopping in the prior art.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for transmitting a broadcast message, including:
the method comprises the steps that a first UE determines time-frequency resource information of the first UE in a No. 0 frame according to a current system frame number T and time-frequency resource information used by at least one other UE before the T frame, wherein the time-frequency resource information comprises a frequency domain resource position and a time domain resource position, the time domain resource position is jointly determined by a time slot group position and a time slot position in a time slot group, and T is an integer greater than or equal to 0;
the first UE determines the frequency domain resource position of the first UE in the frame T according to the current system frame number T and the frequency domain resource position of the first UE in the frame 0;
the first UE determines the time slot group position and the time slot position of the first UE in a frame T according to the current system frame number T and the time-frequency resource information of the first UE in the frame 0, and determines the time domain resource position of the first UE in the frame T, wherein in a period of one frame N, the time domain resource position of the first UE and the time domain resource position of the second UE are separated by at least 3 time slots in the number of N-1 times, the second UE is any one of the other at least one UE, and N is an integer greater than 1;
and the first UE sends the broadcast message of the first UE by using the resources of the frequency domain resource position and the time domain resource position of the frame with the number T.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, by the first UE, a slot group position and a slot position of the first UE in a frame T according to the current system frame number T and time-frequency resource information of the first UE in the frame 0 includes:
the first UE takes the current system frame number T as a parameter, and carries out linear transformation on the frequency domain resource position and the time domain resource position of the first UE in the No. 0 frame so as to determine the time slot group position of the first UE in the No. T frame;
and the first UE determines the time slot position of the first UE in the frame No. 0 as the time slot position of the first UE in the frame No. T.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the performing, by the first UE, linear transformation on a frequency domain resource position and a time domain resource position of the first UE in a frame 0 by using the current system frame number T as a parameter to determine a slot group position of the first UE in the frame T includes:
and the first UE determines the time domain resource position of the first UE after the time slot group position of the frame 0 is translated by L x T time slot groups as the time slot group position of the first UE in the frame T, wherein L is determined by the time slot position of the first UE in the frame 0 and the frequency domain resource position of the first UE in the frame 0, and is an integer greater than or equal to 0.
With reference to the first aspect and the first to second possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, the determining, by the first UE, a frequency domain resource location of the first UE in a frame T according to the current system frame number T and the frequency domain resource location of the first UE in the frame 0 includes:
the first UE determines the frequency domain resource position of the first UE in the frame No. 0 as the frequency domain resource position of the first UE in the frame No. T; or,
and the first UE translates the frequency domain resource position of the first UE in the frequency domain resource position of the No. 0 frame by c × T subcarriers, and determines the frequency domain resource position of the first UE in the No. T frame, wherein c is an integer greater than 0.
With reference to the first aspect and the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, the frequency domain resource location includes m subcarriers, the time domain resource location includes n timeslot groups, each timeslot group includes 3 timeslots, where n is a prime number greater than or equal to 3 × m, and n and m are integers greater than 0.
In a second aspect, an embodiment of the present invention provides an apparatus for transmitting a broadcast message, including:
an initial resource determining unit, configured to determine, according to a current system frame number T and time-frequency resource information used by at least one other UE before a frame T, time-frequency resource information of the first UE in the frame 0, where the time-frequency resource information includes a frequency-domain resource location and a time-domain resource location, where the time-domain resource location is determined by a time-slot group location and a time-slot location in the time-slot group, and T is an integer greater than or equal to 0;
a frequency domain resource determining unit, configured to determine, according to the current system frame number T and the frequency domain resource location of the first UE in frame 0, the frequency domain resource location of the first UE in frame T;
a time domain resource determining unit, configured to determine, according to the current system frame number T and time-frequency resource information of the first UE in frame 0, a time slot group position and a time slot position of the first UE in frame T, and determine a time domain resource position of the first UE in frame T, where in a period of one N frame, the time domain resource position of the first UE and the time domain resource position of the second UE have N-1 times of interval of at least 3 time slots, the second UE is any one of the at least one other UE, and N is an integer greater than 1;
and a broadcast message transmission unit, configured to send the broadcast message of the first UE using the resources in the frequency domain resource location and the time domain resource location of the T-frame.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the time domain resource determining unit includes a time slot group determining unit and a time slot determining unit, wherein,
the time slot group determining unit is configured to perform linear transformation on the frequency domain resource position and the time domain resource position of the first UE in the frame 0 using the current system frame number T as a parameter, so as to determine the time slot group position of the first UE in the frame T;
the time slot determining unit is configured to determine the time slot position of the first UE in frame 0 as the time slot position of the first UE in frame T.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect,
the timeslot group determining unit is specifically configured to determine a time domain resource position of the first UE after shifting a timeslot group position of the frame 0 by L × T timeslot groups as a timeslot group position of the first UE in the frame T, where L is determined by the timeslot position of the first UE in the frame 0 and the frequency domain resource position of the first UE in the frame 0, and L is an integer greater than or equal to 0.
With reference to the second aspect and the first to second possible implementation manners of the second aspect, in a third possible implementation manner of the second aspect,
the frequency domain resource determining unit is specifically configured to determine the frequency domain resource position of the first UE in frame No. 0 as the frequency domain resource position of the first UE in frame No. T; or, determining the frequency domain resource position of the first UE after shifting the frequency domain resource position of frame 0 by c × T subcarriers as the frequency domain resource position of the first UE in frame T, where c is an integer greater than 0.
In a third aspect, an embodiment of the present invention provides an apparatus for transmitting a broadcast message, the apparatus including a processor and a transceiver, wherein,
the processor is configured to determine, according to a current system frame number T and time-frequency resource information used by other at least one UE before the frame T, time-frequency resource information of the first UE in the frame 0, where the first UE is any UE except the other at least one UE; determining the frequency domain resource position of the first UE in the frame T according to the current system frame number T and the frequency domain resource position of the first UE in the frame 0; determining a time slot group position and a time slot position of the first UE in a frame T according to the current system frame number T and time-frequency resource information of the first UE in the frame 0, and determining a time domain resource position of the first UE in the frame T, wherein in a period of a frame N, the time domain resource position of the first UE and the time domain resource position of the second UE are separated by at least 3 time slots for N-1 times, the second UE is any one of the other at least one UE, and N is an integer greater than 1;
and the transceiver is configured to send the broadcast message of the first UE using the resources of the frequency domain resource location and the time domain resource location of the frame T.
With reference to the third aspect, in a first possible implementation manner of the third aspect,
the processor is specifically configured to perform linear transformation on the frequency domain resource position and the time domain resource position of the first UE in frame 0 with the current system frame number T as a parameter, so as to determine the slot group position of the first UE in frame T; and determining the time slot position of the first UE in the frame 0 as the time slot position of the first UE in the frame T.
With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect,
the processor is specifically configured to determine a time domain resource position of the first UE after shifting the slot group position of the frame 0 by L × T slot groups as the slot group position of the first UE in the frame T, where L is determined by the slot position of the first UE in the frame 0 and the frequency domain resource position of the first UE in the frame 0, and L is an integer greater than or equal to 0.
With reference to the third aspect and the first to second possible implementation manners of the third aspect, in a third possible implementation manner of the third aspect,
the processor is specifically configured to determine a frequency domain resource location of the first UE in frame 0 as a frequency domain resource location of the first UE in frame T; or, determining the frequency domain resource position of the first UE after shifting the frequency domain resource position of frame 0 by c × T subcarriers as the frequency domain resource position of the first UE in frame T, where c is an integer greater than 0.
The embodiment of the invention provides a transmission method and a device of broadcast messages, by dividing time domain resource positions into time slot group positions and time slot positions, therefore, a first UE can determine the time slot group position and the time slot position of the first UE in a T number frame according to the time slot group position and the time slot position in a 0 number frame, so that in a period of N frames, the time domain resource position of the first UE and the time domain resource position of a second UE have N-1 times of at least 3 time slots, namely, in the N-1 frame, the time domain resource positions of any two UEs using different time frequency resources are at least 3 time slots apart, because only the UE adjacent to the time slot needs to wait for time slot intervals when receiving and sending the broadcast messages, any two UEs using different time frequency resources can receive and send the broadcast messages without waiting for the reserved time slot intervals, the problems of communication speed reduction and time-frequency resource waste caused by the reserved time slot interval when the UE performs frequency hopping in the prior art are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram illustrating a prior art channel resource partitioning;
fig. 2 is a first flowchart of a method for transmitting a broadcast message according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for transmitting a broadcast message according to an embodiment of the present invention;
fig. 4 is a frequency hopping pattern of a method for transmitting a broadcast message according to an embodiment of the present invention;
fig. 5 is a hardware schematic diagram of an apparatus for transmitting a broadcast message according to an embodiment of the present invention;
fig. 6 is a first schematic structural diagram of an apparatus for transmitting a broadcast message according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a broadcast message transmission apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to apply the method for transmitting a broadcast message according to the embodiments of the present invention to perform frequency hopping, in each frame, as shown in table 1, a channel resource may be divided into m subcarriers i in a horizontal frequency domain direction, and divided into n slot groups j in a vertical time domain direction, where each slot group includes 3 slots k, where n is a prime number greater than or equal to 3 × m, and n > m > 0.
TABLE 1
In the prior art, when two UEs (e.g., a and B) using adjacent time slots transmit and receive broadcast information, the two UEs need to wait for the duration of the reserved time slot interval before transmitting and receiving the broadcast information, and therefore, when the duration of one time slot itself is short (e.g., 40 ms for the time slot and 20 ms for the time slot interval), the slot interval ratio is increased, the communication speed of the UE is increased to a great extent, and time-frequency resources are wasted.
In the present invention, as shown in table 1, the channel time-frequency resources are subdivided, and the time-domain resources are divided into time slot groups and time slots in the time slot groups, that is, the time-domain resource positions are distinguished by the sequence pairs (j, k), so that when two UEs (e.g., a and C) using different time-frequency resources do not hop in the same time slot group in a frequency hopping period (N frames) as much as possible, the time slot interval between adjacent time slots does not need to be reserved when the UEs transmit and receive broadcast information, thereby improving the communication speed and improving the utilization rate of the time-frequency resources.
Example one
An embodiment of the present invention provides a method for transmitting a broadcast message, as shown in fig. 2, including:
101. and the first UE determines the time-frequency resource information of the first UE in the No. 0 frame according to the current system frame number T and the time-frequency resource information used by at least one other UE before the T frame, wherein T is an integer more than or equal to 0.
102. And the first UE determines the frequency domain resource position of the first UE in the frame T according to the current system frame number T and the frequency domain resource position of the first UE in the frame 0.
103. The method comprises the steps that a first UE determines the time slot group position and the time slot position of the first UE in a frame T according to a current system frame number T and time frequency resource information of the first UE in the frame 0, and determines the time domain resource position of the first UE in the frame T, wherein in a period of a frame N, the time domain resource position of the first UE and the time domain resource position of a second UE are separated by at least 3 time slots for N-1 times, the second UE is any one of other at least one UE, and N is an integer larger than 1.
104. And the first UE sends the broadcast message of the first UE by using the resources of the frequency domain resource position and the time domain resource position of the frame T.
In step 101, the time-frequency resource information includes a frequency-domain resource location and a time-domain resource location, where the time-domain resource location is determined by a timeslot group location and a timeslot location in each timeslot group, and the first UE may be any one of all UEs in the D2D system.
Specifically, the first UE may obtain the current system frame number T through system broadcast of the base station, and in addition, before the T frame, the first UE may also monitor time-frequency resource information used by other UEs when other UEs send respective broadcast messages from the 0 frame to the T-1 frame, that is, a frequency domain resource location i and a time domain resource location (j, k) used by other UEs from the 0 frame to the T-1 frame. Furthermore, the first UE determines, according to the frequency domain resource location i used by the other UEs before frame T and the time domain resource location (j, k), the time-frequency resource information of the first UE in frame 0, where the time-frequency resource information includes the frequency domain resource location i (0) of the first UE and the time domain resource location (j (0), k (0)) of the first UE.
For example, since the first UE monitors the time-frequency resource information used by other UEs when transmitting their respective broadcast messages from frame 0 to frame T-1, when a certain time-frequency resource is not occupied by UEs from frame 0 to frame T-1, the first UE can determine that the time-frequency resource is the time-frequency resource occupied when it transmits the broadcast message, and determine the time-frequency resource information of itself in frame 0, i.e., the frequency domain resource location i (0), and the time domain resource location (j (0), k (0). Of course, if the current system frame number T is frame 0, that is, the current frame is frame 1, the first UE may directly determine the time-frequency resource information of itself in frame 0 according to the system broadcast sent between the base stations or UEs.
In step 102, after determining the frequency domain resource location i (0) of the first UE in frame No. 0 and the frequency domain resource location (j (0), k (0)) of the first UE, the first UE determines the frequency domain resource location i (T) of the first UE in frame T according to the current system frame number T and the frequency domain resource location of the first UE in frame No. 0.
Specifically, the first UE may determine the frequency domain resource location i (0) of the first UE in frame 0 as the frequency domain resource location i (T) of the first UE in frame T; or the first UE determines the frequency domain resource position of the first UE after shifting c × T subcarriers at the frequency domain resource position i (0) of frame No. 0 as the frequency domain resource position i (T) of the first UE at frame T, where c is an integer greater than 0.
In step 103, after determining the frequency domain resource location i (0) of the first UE in frame 0 and the time domain resource location (j (0), k (0)) of the first UE, the first UE determines the slot group location j (T) and the slot location k (T) of the first UE in frame T according to the frequency domain resource location i (0) of the first UE in frame 0 and the time domain resource location (j (0), k (0)) of the first UE, so that j (T) and k (T) constitute the time domain resource location of the first UE in frame T.
Specifically, when determining the timeslot group position j (T) of the first UE in frame T, the first UE may perform linear transformation on the frequency domain resource position and the time domain resource position of the first UE in frame 0 by using the current system frame number T as a parameter to determine the timeslot group position of the first UE in frame T, so that the time domain resource position of the first UE (assuming that the first UE is a) in a period of N frames is separated from the time domain resource position of the second UE (assuming that the second UE is B) by at least 3 timeslots N-1 times, where the second UE is any one of the other UEs, that is, j is any one of the other UEsA(T)-jB(T) in one N frame periodAt least N-1 times in the period are not 0.
Therefore, any two UEs (for example, a and B) using different time-frequency resources may not be in the same timeslot group as much as possible in the frequency hopping period (N frames), and then, when the UE receives and transmits the broadcast information, the timeslot interval between adjacent timeslots does not need to be reserved, thereby improving the communication speed and improving the utilization rate of the time-frequency resources.
Further, when the first UE linearly transforms the frequency domain resource position and the time domain resource position of the first UE in frame 0, the time domain resource position of the first UE after shifting the time slot group position of frame 0 by L × T time slot groups may be determined as the time slot group position of the first UE in frame T, where L is determined by the time slot position of the first UE in frame 0 and the frequency domain resource position of the first UE in frame 0, and L is an integer greater than or equal to 0.
In step 104, after the first UE determines the frequency domain resource location i (T), the time slot group location j (T), and the time slot location k (T) in frame T, the first UE transmits the broadcast message of the first UE using the resources indicated by the frequency domain resource location i (T), the time slot group location j (T), and the time slot location k (T).
The embodiment of the invention provides a transmission method of broadcast messages, which divides time domain resource positions into time slot group positions and time slot positions, so that a first UE can determine the time slot group position and the time slot position of the first UE in a T number frame according to the time slot group position and the time slot position in a 0 number frame, then, in a cycle of an N frame, the time domain resource position of the first UE and the time domain resource position of a second UE are separated by at least 3 time slots for N-1 times, namely, in the N-1 frame, the time domain resource positions of any two UEs using different time frequency resources are separated by at least 3 time slots, because only the UE adjacent to the time slots needs to wait for time slot intervals when receiving and sending broadcast messages, any two UEs using different time frequency resources can receive and send broadcast messages without waiting for the reserved time slot intervals, the problems of communication speed reduction and time-frequency resource waste caused by the reserved time slot interval when the UE performs frequency hopping in the prior art are solved.
Example two
An embodiment of the present invention provides a method for transmitting a broadcast message, as shown in fig. 3, including:
201. the method comprises the steps that first UE determines the frequency domain resource position, the time slot group position and the time slot position of the first UE in a No. 0 frame corresponding to a T-number frame according to a current system frame number T and time frequency resource information used by other UE before the T-number frame, wherein T is an integer larger than or equal to 0;
202. the method comprises the steps that a first UE translates the frequency domain resource position of the first UE in the frequency domain resource position of a No. 0 frame by c x T subcarriers, and determines the frequency domain resource position of the first UE in the T frame, wherein c is an integer greater than or equal to 0;
203. the first UE takes the current system frame number T as a parameter, and carries out linear transformation on the frequency domain resource position and the time domain resource position of the first UE in the No. 0 frame so as to determine the time slot group position of the first UE in the No. T frame;
204. the first UE determines the time slot position of the first UE in the frame No. 0 as the time slot position of the first UE in the frame No. T;
205. in the T frame, the first UE sends a broadcast message of the first UE using the time-frequency resource information determined by the frequency-domain resource location, the timeslot group location, and the timeslot location of the T frame determined in steps 202 to 204.
In step 201, as shown in table 1, the time-frequency resource information includes a frequency domain resource location i and a time domain resource location (j, k), where the time domain resource location (j, k) is determined by the time slot group location j and the time slot location k in each time slot group, and for convenience of description, the terminal a is taken as the first UE and the terminal B is taken as the second UE in the following embodiments.
Specifically, the first UE may obtain the current system frame number N through system broadcast of the base station, and meanwhile, before the T frame, the first UE may also monitor time-frequency resource information used by other UEs when other UEs send respective broadcast messages from the 0 frame to the T-1 frame, that is, a frequency domain resource location i and a time domain resource location (j, k) used by other UEs from the 0 frame to the T-1 frame. Furthermore, the first UE confirms the resource position according to the frequency domain resource position i and the time domain resource position (j, k) used by other UEs before the frame TTime frequency resource information of the user equipment in the No. 0 frame is determined, and the time frequency resource information comprises a frequency domain resource position i of the first UEA(0) And time domain resource location (j) of the first UEA(0)，kA(0))，T≥0。
Determining the frequency domain resource position i of the first UE in frame 0A(0) And time domain resource location (j) of the first UEA(0)，kA(0) Then, the first UE performs step 202 to determine the frequency domain resource location i of the first UE in frame T according to the current system frame number T and the frequency domain resource location of the first UE in frame 0A(T), alternatively, the first UE may also perform steps 203 to 204 to determine the time domain resource location (j) of the first UE in frame TA(T)，kA(T))。
In step 202, the first UE determines the frequency domain resource location i of the first UE in frame T according to the current system frame number T and the frequency domain resource location of the first UE in frame 0A(T), the first UE may be located in frequency domain resource location i of frame 0A(0) Translating the frequency domain resource positions of the c × T subcarriers, and determining the frequency domain resource positions i of the first UE in the frame TA(T), c is an integer of 0 or more, namely:
iA(T)＝iA(0)+c*T mod m。
it can be seen that when c is 0, the first UE locates the first UE in the frequency domain resource location i of frame No. 0A(0) Determined as the frequency domain resource position i of the first UE in frame TA(T)。
In step 203, the first UE determines the slot group position j of the first UE in the frame T according to the current system frame number T and the time-frequency resource information of the first UE in the frame 0A(T), the first UE may use the current system frame number T as a parameter to determine the frequency domain resource location i of the first UE in frame 0A(0) And time domain resource location (j)A(0)，kA(0) Linear transformation to determine slot group position j of the first UE in frame TA(T) such that the time domain resource location of the first UE (terminal A) within a period of one N frame is N-1 times separated by at least 3 time slots from the time domain resource location of the second UE (terminal B), that is, jA(T)-jB(T) is not 0. Thus, theAny two UEs (for example, a and B) using different time-frequency resources may not be in the same timeslot group as much as possible in the frequency hopping period (N frames), and therefore, the timeslot interval between adjacent timeslots does not need to be reserved when the UEs receive and transmit broadcast information, thereby improving communication speed and improving the utilization rate of the time-frequency resources.
For example, the first UE may locate the first UE in slot group position j of frame 0A(0) Translating the time domain resource positions of the L-T time slot groups, and determining the time domain resource positions as the time slot group positions j of the first UE in the T number frameA(T), wherein L is determined by the time slot position of the first UE in frame 0 and the frequency domain resource position of the first UE in frame 0, L ≧ 0, that is:
jA(T)＝jA(0)+L*T＝jA(0)+(3iA(0)+kA(0))*T(1)mod n；
when N is a prime number greater than or equal to 3 × m in table 1, the above formula may make the time domain resource location of the first UE (terminal a) within one N frame period N-1 times separated from the time domain resource location of the second UE (terminal B) by at least 3 slots, which proves as follows:
jA(T)＝jA(0)+(3iA(0)+kA(0))*T mod n；
jB(T)＝jB(0)+(3iB(0)+kB(0))*T mod n；
suppose kA(0)≤kB(0)，
1) When k isA(0)＝kB(0) The method comprises the following steps:
jA(T)-jB(T)＝jA(0)+(3iA(0)+kA(0))*T-jB(0)+(3iB
(0)+kB(0))*T
＝jA(0)-jB(0)+3(iA(0)-iB(0) t mod n if i)A(0)＝iB(0) Since terminal A and terminal B use different time-frequency resources, jA(0) Is not equal to jB(0) Thus, jA(T)-jB(T) is not 0, so terminal A and terminal B are in one periodThe slot group positions of any T number frame are at least 3 slots apart.
If iA(0) Is not equal to iB(0) Then, only at jA(0)-jB(0)+3(iA(0)-iB(0) T is 0, terminal a and terminal B are in the same position in the slot group of frame T, and since n is a prime number greater than or equal to 3 m, equation jA(0)-jB(0)+3(iA(0)-iB(0) T-0 has only one solution in a period of N frames, i.e., j is N-1 timesA(T)-jB(T) is not 0.
2) When k isA(0) Is not equal to kB(0) Then, two cases can be divided, namely:
kA(0) and k isB(0) A phase difference of 1 or kA(0) And k isB(0) The phase difference is 2.
Specifically, when k isA(0) And k isB(0) When the phase difference is 1, namely: k is a radical ofA(0)＝0，kB(0) 1 is ═ 1; or, kA(0)＝1，kB(0)＝2。
At this time, only when jA(T)-jBWhen (T)' 0, the slot group positions of terminal a and terminal B in the T frame are the same, and the slot positions of terminal a and terminal B are adjacent to each other.
jA(T)-jB(T)＝jA(0)-jB(0)+(3(iA(0)-iB(0))-1)*T mod n
Since N is a prime number greater than or equal to 3 × m, the above formula has j times within one N frame periodA(T)-jB(T) is 0, and thus, in a period of one N frame, there are cases where the slot positions of terminal a and terminal B are not adjacent N-1 times.
When k isA(0) And k isB(0) When the phase difference is 2, namely: k is a radical ofA(0)＝0，kB(0) At this time, only when jA(T)-jBWhen T is 1, the slot positions of T frame are adjacent to terminal a and terminal B.
jA(T)-jB(T)＝jA(0)-jB(0)+(3(iA(0)-iB(0))-2)*T mod n
Since N is a prime number greater than or equal to 3 × m, the above formula has j times within one N frame periodA(T)-jB(T) is 1, and thus, in a period of one N frame, there are cases where the slot positions of terminal a and terminal B are not adjacent N-1 times.
In summary, the first UE can determine the slot group position j of the first UE in frame T according to equation (1)AAnd (T), ensuring that in a period of N frames, the time domain resource position of the first UE (terminal A) and the time domain resource position of the second UE (terminal B) have N-1 time intervals of at least 3 time slots.
In step 204, the first UE determines the slot position k of the first UE in frame TA(T), the first UE may be in slot position k of frame 0A(0) Determining a slot position k of the first UE in a frame TA(T), namely:
kA(T)＝kA(0)。
in step 205, after the first UE has performed steps 201 to 204, it can determine the frequency domain resource location i of the first UE in frame TA(T), slot group position jA(T) and slot position kA(T), then the first UE may acquire the frequency domain resource location iA(T), slot group position jA(T) and slot position kA(T) a resource of the indicated location, and transmitting a broadcast message of the first UE using the resource.
It can be seen that, if any UE sends its own broadcast message according to the method in steps 201 to 205, it can be ensured that N-1 time slot positions are not adjacent to each other in each N frame period when any two UEs using different time-frequency resource information send the broadcast message, and therefore, there is no need to wait for a reserved time slot interval to perform data transmission during the N-1 time broadcast message transceiving process, thereby improving the communication rate between UEs and improving the utilization rate of time-frequency resources.
Exemplarily, as shown in fig. 4, the hopping pattern is obtained by the UE performing frequency hopping according to the transmission method of the broadcast message when m is 2, n is 7, and c is 0, and the period is 7 frames, where f is a frame number. Taking time-frequency resource information No. 1 as an example, in frame 0, i (0) ═ 0, j (0) ═ 0, k (0) ═ 1, and in frame 1, i (1) ═ i (0) + c ═ 1 ═ 0; j (0) ═ j (0) + (3i (0) + k (0)) × 1 ═ 1; k (1) ═ k (0) ═ 1.
In a period of 7 frames, the time-frequency resources at the position of the time slot adjacent to the time-frequency resource No. 1 in the time frame No. 0 never repeatedly appear in the frames 1 to 6, so that the data transmission can be performed without waiting for the reserved time slot interval in the process of receiving and transmitting the broadcast messages of 6 times.
The embodiment of the invention provides a transmission method of broadcast messages, which divides time domain resource positions into time slot group positions and time slot positions, so that a first UE can determine the time slot group position and the time slot position of the first UE in a T number frame according to the time slot group position and the time slot position of a 0 number frame, then, in a cycle of an N frame, the time domain resource position of the first UE and the time domain resource position of a second UE are separated by at least 3 time slots for N-1 times, namely, in the N-1 frame, the time domain resource positions of any two UEs using different time frequency resources are separated by at least 3 time slots, because only the UE adjacent to the time slots needs to wait for time slot intervals when receiving and sending the broadcast messages, any two UEs using different time frequency resources can receive and send the broadcast messages without waiting for the reserved time slot intervals, the problems of communication speed reduction and time-frequency resource waste caused by the reserved time slot interval when the UE performs frequency hopping in the prior art are solved.
EXAMPLE III
Fig. 5 is a hardware schematic diagram of a broadcast message transmission apparatus according to the present invention.
The broadcast message transmission Device may be various UEs in a D2D (Device to Device) communication network (i.e., a communication method in which devices directly communicate with each other without going through a base station).
As shown in fig. 5, the control device includes a processor 11, a transceiver 12, a memory 13, and a bus 14.
Wherein the processor 11, the transceiver 12 and the memory 13 communicate via a bus 14.
The processor 11 is a control center of the UE, and the processor 11 processes data received by the transceiver 12 and calls software or programs in the memory 13 to execute various functions of the UE.
The transceiver 12 is used for receiving and transmitting signals in the process of information transmission and reception or conversation, and the transceiver 12 receives the information transmitted by the terminal and then processes the information to the processor 11; in addition, the transceiver 12 may communicate with networks and other devices via wireless communication.
A memory 13 for storing software programs or data, and a processor 11 for executing various functional applications and data processing of the UE by operating the software programs or data stored in the memory 13.
In the embodiment of the present invention, the transceiver 12 obtains time-frequency resource information used by the current system frame number T and other UEs before the T-frame, and stores the time-frequency resource information used by the current system frame number T and other UEs before the T-frame in the memory 13, where the time-frequency resource information includes a frequency domain resource location and a time domain resource location, where the time domain resource location is determined by a time slot group location and a time slot location in each time slot group, and T is greater than or equal to 0, and further, the processor 11 determines the time-frequency resource information of the first UE in the 0-frame according to the time-frequency resource information used by the current system frame number T and other UEs before the T-frame in the memory 13; the processor 11 determines the frequency domain resource position of the first UE in frame T according to the current system frame number T in the memory 13 and the frequency domain resource position of the first UE in frame 0; the processor 11 determines a time slot group position and a time slot position of the first UE in a frame T according to a current system frame number T in the memory 13 and time-frequency resource information of a frame 0 of the first UE, and determines a time domain resource position of the first UE in the frame T, so that in a period of one frame N, the time domain resource position of the first UE and the time domain resource position of the second UE have N-1 times of interval of at least 3 time slots, the second UE is any one of the other at least one UE, and N is an integer greater than 1; finally, the transceiver 12 transmits the broadcast message of the first UE using the resources of the frequency domain resource location and the time domain resource location of the frame T.
Further, when the processor 11 determines the slot group position and the slot position of the first UE in the T frame according to the current system frame number T in the memory 13 and the time-frequency resource information of the first UE in the 0 th frame, the processor 11 may be further specifically configured to: taking the current system frame number T as a parameter, and performing linear transformation on the frequency domain resource position and the time domain resource position of the first UE in the No. 0 frame to determine the time slot group position of the first UE in the No. T frame; and determining the time slot position of the first UE in the frame 0 as the time slot position of the first UE in the frame T.
Further, when the processor 11 uses the current system frame number T as a parameter to perform linear transformation on the frequency domain resource position and the time domain resource position of the first UE in the frame 0 to determine the timeslot group position of the first UE in the frame T, the processor 11 may be further specifically configured to: and determining the time domain resource position of the first UE after the time slot group position of the frame 0 is translated by L x T time slot groups as the time slot group position of the first UE in the frame T, wherein L is determined by the time slot position of the first UE in the frame 0 and the frequency domain resource position of the first UE in the frame 0, and is an integer greater than or equal to 0.
Further, when the processor 11 determines the frequency domain resource location of the first UE in frame T according to the current system frame number T in the memory 13 and the frequency domain resource location of the first UE in frame 0, the processor 11 may be further specifically configured to: determining the frequency domain resource position of the first UE in frame No. 0 as the frequency domain resource position of the first UE in frame No. T; or, determining the frequency domain resource position of the first UE after shifting the frequency domain resource position of frame 0 by c × T subcarriers as the frequency domain resource position of the first UE in frame T, where c is an integer greater than 0.
The frequency domain resource position comprises m subcarriers, the time domain resource position comprises n time slot groups, each time slot group comprises 3 time slots, wherein n is a prime number which is larger than or equal to 3 m, and n is larger than m and larger than 0.
The embodiment of the invention provides UE, which divides the time domain resource position into a time slot group position and a time slot position, so that a first UE can determine the time slot group position and the time slot position of the first UE in a T frame according to the time slot group position and the time slot position in a 0 frame, therefore, in a period of N frames, the time domain resource position of the first UE and the time domain resource position of a second UE are at least 3 time slots separated by N-1 times, namely, in the N-1 frame, the time domain resource positions of any two UEs using different time frequency resources are at least 3 time slots separated, because the time slot interval is required to be waited only when the UE adjacent to the time slot receives and transmits the broadcast message, the receiving and transmitting operation of the broadcast message can be carried out without waiting for the reserved time slot interval when any two UEs using different time frequency resources receive and transmit the broadcast message, the problems of communication speed reduction and time-frequency resource waste caused by the reserved time slot interval when the UE performs frequency hopping in the prior art are solved.
Example four
An embodiment of the present invention provides a device for transmitting a broadcast message, as shown in fig. 6, including:
an initial resource determining unit 21, configured to determine, according to a current system frame number T and time-frequency resource information used by at least one other UE before a frame T, time-frequency resource information of the first UE in the frame 0, where the time-frequency resource information includes a frequency domain resource location and a time domain resource location, where the time domain resource location is determined by a time slot group location and a time slot location in a time slot group, and T is an integer greater than or equal to 0;
a frequency domain resource determining unit 22, configured to determine, according to the current system frame number T in the initial resource determining unit 21 and the frequency domain resource location of the first UE in frame 0, the frequency domain resource location of the first UE in frame T;
a time domain resource determining unit 23, configured to determine, according to the current system frame number T in the initial resource determining unit 21 and the time-frequency resource information of the first UE in frame 0, a time slot group position and a time slot position of the first UE in frame T, and determine a time domain resource position of the first UE in frame T, where in a cycle of N frames, the time domain resource position of the first UE and the time domain resource position of the second UE have N-1 time intervals of at least 3 time slots, the second UE is any one of the at least one other UE, and N is an integer greater than 1;
a broadcast message transmission unit 24, configured to send a broadcast message of the first UE using the resources of the frequency domain resource location and the time domain resource location of the frame No. T determined in the frequency domain resource determination unit 22 and the time domain resource determination unit 23.
Further, as shown in fig. 7, the time domain resource determining unit includes a slot group determining unit 25 and a slot determining unit 26, wherein,
the timeslot group determining unit 25 is configured to perform linear transformation on the frequency domain resource position and the time domain resource position of the first UE in frame 0 using the current system frame number T as a parameter, so as to determine the timeslot group position of the first UE in frame T;
the time slot determining unit 26 is configured to determine the time slot position of the first UE in frame 0 as the time slot position of the first UE in frame T.
Further, the timeslot group determining unit 25 is specifically configured to determine a time domain resource position of the first UE after shifting the timeslot group position of the frame 0 by L × T timeslot groups as the timeslot group position of the first UE in the frame T, where L is determined by the timeslot position of the first UE in the frame 0 and the frequency domain resource position of the first UE in the frame 0, and L is an integer greater than or equal to 0.
Further, the frequency domain resource determining unit 22 is specifically configured to determine the frequency domain resource location of the first UE in frame 0 as the frequency domain resource location of the first UE in frame T; or, determining the frequency domain resource position of the first UE after shifting the frequency domain resource position of frame 0 by c × T subcarriers as the frequency domain resource position of the first UE in frame T, where c is an integer greater than 0.
The frequency domain resource position comprises m subcarriers, the time domain resource position comprises n time slot groups, each time slot group comprises 3 time slots, wherein n is a prime number which is larger than or equal to 3 m, and n is larger than m and larger than 0.
The embodiment of the invention provides a transmission device of broadcast messages, which divides the time domain resource position into a time slot group position and a time slot position, so that a first UE can determine the time slot group position and the time slot position of the first UE in a T number frame according to the time slot group position and the time slot position in a 0 number frame, then, in a cycle of an N frame, the time domain resource position of the first UE and the time domain resource position of a second UE are separated by at least 3 time slots for N-1 times, namely, in the N-1 frame, the time domain resource positions of any two UEs using different time frequency resources are separated by at least 3 time slots, because only the UE adjacent to the time slots needs to wait for the time slot interval when receiving and sending the broadcast messages, any two UEs using different time frequency resources can receive and send the broadcast messages without waiting for the reserved time slot interval, the problems of communication speed reduction and time-frequency resource waste caused by the reserved time slot interval when the UE performs frequency hopping in the prior art are solved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (14)
1. A method for transmitting a broadcast message, comprising:
the method comprises the steps that a first UE determines time-frequency resource information of the first UE in a No. 0 frame according to a current system frame number T and time-frequency resource information used by at least one other UE before the T frame, wherein the time-frequency resource information comprises a frequency domain resource position and a time domain resource position, the time domain resource position is jointly determined by a time slot group position and a time slot position in a time slot group, and T is an integer greater than or equal to 0;
the first UE determines the frequency domain resource position of the first UE in the frame T according to the current system frame number T and the frequency domain resource position of the first UE in the frame 0;
the first UE determines the time slot group position and the time slot position of the first UE in a frame T according to the current system frame number T and the time-frequency resource information of the first UE in the frame 0, and determines the time domain resource position of the first UE in the frame T, wherein in a period of one frame N, the time domain resource position of the first UE and the time domain resource position of the second UE are separated by at least 3 time slots in the number of N-1 times, the second UE is any one of the other at least one UE, and N is an integer greater than 1;
and the first UE sends the broadcast message of the first UE by using the resources of the frequency domain resource position and the time domain resource position of the frame with the number T.
2. The method as claimed in claim 1, wherein the determining, by the first UE, the slot group position and the slot position of the first UE in frame T according to the current system frame number T and the time-frequency resource information of the first UE in frame 0 includes:
the first UE takes the current system frame number T as a parameter, and carries out linear transformation on the frequency domain resource position and the time domain resource position of the first UE in the No. 0 frame so as to determine the time slot group position of the first UE in the No. T frame;
and the first UE determines the time slot position of the first UE in the frame No. 0 as the time slot position of the first UE in the frame No. T.
3. The method as claimed in claim 2, wherein the linearly transforming, by the first UE, the frequency domain resource location and the time domain resource location of the first UE in frame 0 with the current system frame number T as a parameter to determine the timeslot group location of the first UE in frame T comprises:
and the first UE determines the time domain resource position of the first UE after the time slot group position of the frame 0 is translated by L x T time slot groups as the time slot group position of the first UE in the frame T, wherein L is determined by the time slot position of the first UE in the frame 0 and the frequency domain resource position of the first UE in the frame 0, and is an integer greater than or equal to 0.
4. The method as claimed in any one of claims 1 to 3, wherein the determining, by the first UE, the frequency-domain resource location of the first UE in frame T according to the current system frame number T and the frequency-domain resource location of the first UE in frame 0 comprises:
the first UE determines the frequency domain resource position of the first UE in the frame No. 0 as the frequency domain resource position of the first UE in the frame No. T; or,
and the first UE translates the frequency domain resource position of the first UE in the frequency domain resource position of the No. 0 frame by c × T subcarriers, and determines the frequency domain resource position of the first UE in the No. T frame, wherein c is an integer greater than 0.
5. The method of any of claims 1-3, wherein the frequency-domain resource locations comprise m subcarriers, wherein the time-domain resource locations comprise n slot groups, each slot group comprising 3 slots, wherein n is a prime number greater than or equal to 3 m, and wherein n and m are integers greater than 0.
6. The method of claim 4, wherein the frequency-domain resource locations comprise m subcarriers, wherein the time-domain resource locations comprise n slot groups, and wherein each slot group comprises 3 slots, wherein n is a prime number greater than or equal to 3 × m, and wherein n and m are integers greater than 0.
7. An apparatus for transmitting a broadcast message, comprising:
an initial resource determining unit, configured to determine, according to a current system frame number T and time-frequency resource information used by at least one other UE before a frame T, time-frequency resource information of a first UE in the frame 0, where the time-frequency resource information includes a frequency-domain resource location and a time-domain resource location, where the time-domain resource location is determined by a time-slot group location and a time-slot location in the time-slot group, and T is an integer greater than or equal to 0;
a frequency domain resource determining unit, configured to determine, according to the current system frame number T and the frequency domain resource location of the first UE in frame 0, the frequency domain resource location of the first UE in frame T;
a time domain resource determining unit, configured to determine, according to the current system frame number T and time-frequency resource information of the first UE in frame 0, a time slot group position and a time slot position of the first UE in frame T, and determine a time domain resource position of the first UE in frame T, where in a period of one N frame, the time domain resource position of the first UE and the time domain resource position of a second UE have N-1 times of interval of at least 3 time slots, the second UE is any one of the other at least one UE, and N is an integer greater than 1;
and a broadcast message transmission unit, configured to send the broadcast message of the first UE using the resources in the frequency domain resource location and the time domain resource location of the T-frame.
8. The apparatus of claim 7, wherein the time domain resource determination unit comprises a slot group determination unit and a slot determination unit, wherein,
the time slot group determining unit is configured to perform linear transformation on the frequency domain resource position and the time domain resource position of the first UE in the frame 0 using the current system frame number T as a parameter, so as to determine the time slot group position of the first UE in the frame T;
the time slot determining unit is configured to determine the time slot position of the first UE in frame 0 as the time slot position of the first UE in frame T.
9. The apparatus of claim 8,
the timeslot group determining unit is specifically configured to determine a time domain resource position of the first UE after shifting a timeslot group position of the frame 0 by L × T timeslot groups as a timeslot group position of the first UE in the frame T, where L is determined by the timeslot position of the first UE in the frame 0 and the frequency domain resource position of the first UE in the frame 0, and L is an integer greater than or equal to 0.
10. The apparatus according to any one of claims 7 to 9,
the frequency domain resource determining unit is specifically configured to determine the frequency domain resource position of the first UE in frame No. 0 as the frequency domain resource position of the first UE in frame No. T; or, determining the frequency domain resource position of the first UE after shifting the frequency domain resource position of frame 0 by c × T subcarriers as the frequency domain resource position of the first UE in frame T, where c is an integer greater than 0.
11. An apparatus for transmitting a broadcast message, the apparatus comprising a processor and a transceiver, wherein,
the processor is configured to determine time-frequency resource information of a first UE in a frame No. 0 according to a current system frame number T and time-frequency resource information used by other at least one UE before the frame T, where the first UE is any UE except the other at least one UE; determining the frequency domain resource position of the first UE in the frame T according to the current system frame number T and the frequency domain resource position of the first UE in the frame 0; determining a time slot group position and a time slot position of the first UE in a frame T according to the current system frame number T and time-frequency resource information of the first UE in the frame 0, and determining a time domain resource position of the first UE in the frame T, wherein in a period of a frame N, the time domain resource position of the first UE and the time domain resource position of a second UE are separated by at least 3 time slots for N-1 times, the second UE is any one of the other at least one UE, and N is an integer greater than 1;
and the transceiver is configured to send the broadcast message of the first UE using the resources of the frequency domain resource location and the time domain resource location of the frame T.
12. The apparatus of claim 11,
the processor is specifically configured to perform linear transformation on the frequency domain resource position and the time domain resource position of the first UE in frame 0 with the current system frame number T as a parameter, so as to determine the slot group position of the first UE in frame T; and determining the time slot position of the first UE in the frame 0 as the time slot position of the first UE in the frame T.
13. The apparatus of claim 12,
the processor is specifically configured to determine a time domain resource position of the first UE after shifting the slot group position of the frame 0 by L × T slot groups as the slot group position of the first UE in the frame T, where L is determined by the slot position of the first UE in the frame 0 and the frequency domain resource position of the first UE in the frame 0, and L is an integer greater than or equal to 0.
14. The apparatus according to any one of claims 11 to 13,
the processor is specifically configured to determine a frequency domain resource location of the first UE in frame 0 as a frequency domain resource location of the first UE in frame T; or, determining the frequency domain resource position of the first UE after shifting the frequency domain resource position of frame 0 by c × T subcarriers as the frequency domain resource position of the first UE in frame T, where c is an integer greater than 0.
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