Method for transmitting an information of a mobile telecommunication system
View Patent ↗Method for transmitting an information representative of the number of spreading codes allocated to the mobile stations in communication with a base station of a mobile telecommunication system, wherein it includes the step of: forming a word, said transmitted word, the content of which is representative of the number of spreading codes allocated, including in each transmission burst a general midamble resulting from the sum of selected midambles among all the available midambles, said selection being done by said base station in relation with said transmitted word so that a selected midamble corresponds to a binary element of said transmitted word equal to a first value and a non-selected midamble corresponds to a binary element of said transmitted word equal to second value, considering a received word the elements of which are in one-to-one relationship with the temporal positions of the estimations respectively corresponding to said available midambles.
1. A method for communicating information representative of a number of spreading codes allocated to at least one mobile station in communication with a base station of a mobile telecommunication system, comprising:
selecting one or more midambles from a set of available midambles in accordance with a value of a binary element of a binary word representative of said number, wherein said available midambles are shifted versions of a basic midamble; and
transmitting the selected one or more midambles as being representative of said binary word.
2. The method according to claim 1 , further comprising: summing the selected one or more midambles prior to transmission.
3. The method according to claim 1 , wherein:
at least a subset of bits of said binary word represents a state corresponding to said number of allocated spreading codes.
4. The method according to claim 3 , wherein:
a binary value of said state corresponds to said number of allocated spreading codes.
5. The method according to claim 3 , wherein:
a position of a bit of said binary word corresponds to said number of spreading codes.
6. The method according to claim 3 , wherein:
a binary value of said state corresponds to a group of numbers of allocated spreading codes.
7. The method according to claim 1 , wherein said transmitting step comprises:
transmitting over multiple channels, wherein:
for each channel, said binary word represents a state corresponding to said number of allocated spreading codes.
8. The method according to claim 7 , wherein:
a binary value of said state corresponds to said number of allocated spreading codes.
9. The method according to claim 7 , wherein:
a position of an N th bit of said binary word corresponds to said number of spreading codes.
10. The method according to claim 7 , wherein:
a binary value of said state corresponds to a group of numbers of allocated spreading codes.
11. The method according to claim 1 , wherein:
each of said available midambles is associated with a corresponding binary element of said binary word, and
said step of selecting one or more midambles comprises:
selecting a midamble if said corresponding binary element is equal to a first value, and
not selecting a midamble if said corresponding binary element is equal to a second value.
12. The method according to claim 11 , wherein:
a binary value of said state corresponds to said number of allocated spreading codes.
13. The method according to claim 11 , wherein:
a position of a bit of said binary word corresponds to said number of spreading codes.
14. The method according to claim 11 , wherein:
a binary value of said state corresponds to a group of numbers of allocated spreading codes.
15. The method according to claim 11 , further comprising:
correlating a received midamble with a sequence based on said basic midamble code at said at least one mobile station; and
forming a received binary word representative of said number of spreading codes, a value of a binary element of said received binary word being determined from one of the presence and the absence of a channel estimation at a temporal position in the correlation result.
16. The method according to claim 15 , wherein:
said binary element of said received binary word corresponds to said temporal position in said correlation result.
17. The method according to claim 1 , further comprising:
correlating a received midamble, at said at least one mobile station, with a sequence based on said basic midamble code; and
forming a received binary word representative of said number of spreading codes, a value of a binary element of said received binary word being determined from one of the presence and the absence of a channel estimation at a temporal position in the correlation result.
18. The method according to claim 17 , wherein:
said binary element of said received binary word corresponds to said temporal position in said correlation result.
19. A base station for a mobile telecommunication system, said base station configured to select one or more midambles from a set of available midambles in accordance with a value of a binary element of a binary word representative of a number of spreading codes allocated to at least one mobile station in communication with said base station, wherein said available midambles are shifted versions of a basic midamble, said base station further configured to transmit the selected one or more midambles as being representative of said binary word.
20. A mobile telecommunication system comprising:
a base station; and
at least one mobile station in communication with the base station, wherein the base station is configured to select one or more midambles from a set of available midambles in accordance with a value of a binary element of a binary word representative of a number of spreading codes allocated to the at least one mobile station, wherein said available midambles are shifted versions of a basic midamble, said base station further configured to transmit the selected one or more midambles as being representative of said binary word.
21. A mobile station for a mobile telecommunication system, wherein the mobile station is configured to receive one or more midambles transmitted from a base station in communication with the mobile station, to correlate the received one or more midambles with a sequence based on a basic midamble code, and to form a received binary word representative of a number of spreading codes allocated to at least one mobile station in communication with said base station, wherein
a value of a binary element of said received binary word is determined from one of the presence and the absence of a channel estimation at a temporal position in the correlation result, and
said one or more midambles transmitted from said base station is selected from a set of available midambles in accordance with a value of a binary element of a binary word representative of said number of spreading codes, and said available midambles are shifted versions of said basic midamble.