Layered session data unit frame
First Claim
1. In an RF communication unit arranged to communicate with a base radio station by transmitting signals over an RF channel 16, the signals arranged to form one or more frames, and where the RF communication unit comprises information to be transmitted, the information comprising a link control field, an encryption field and a user field, wherein the user information is encrypted, a method of forming a frame comprising the following steps:
- (a) dividing the user field into a first area and a second area;
(b) imbedding the link control field for the purpose of addressing in the first area; and
(c) imbedding the encryption field in the second area.
2 Assignments
0 Petitions
Accused Products
Abstract
A layered session data unit frame (300) is provided wherein a first frame (200), designated a session data unit("SDU"), containing user information (209), a link control field (205) and an encryption field (207), is divided into a plurality of smaller frames (321, 323), each having an information field and designated a link data unit("LDU"). According to the invention, the SDU user information (209) is allocated into the information fields (211, 213) of the plurality of LDU'"'"'s. The SDU link control field (205) is divided into a plurality of sub-fields and imbedded into the information fields of a first group of LDU'"'"'s. The SDU encryption field (207) is divided into a plurality of sub-fields and imbedded into the information fields of a second group of LDU'"'"'s. The sub-fields may be distributed throughout the LDU'"'"'s in a generally uniform fashion. For instance, where the user information comprises coded voice words, the sub-fields may be separated by 30 msec words such that voice may be produced during the transmission of the field without any audio delay.
103 Citations
24 Claims
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1. In an RF communication unit arranged to communicate with a base radio station by transmitting signals over an RF channel 16, the signals arranged to form one or more frames, and where the RF communication unit comprises information to be transmitted, the information comprising a link control field, an encryption field and a user field, wherein the user information is encrypted, a method of forming a frame comprising the following steps:
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(a) dividing the user field into a first area and a second area; (b) imbedding the link control field for the purpose of addressing in the first area; and (c) imbedding the encryption field in the second area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An RF communication unit arranged to communicate with a base radio station by transmitting signals over an RF channel 16, the signals arranged to form one or more frames, and where the RF communication unit comprises information to be transmitted, the information comprising a link control field, an encryption field and a user field, wherein the user information is encrypted, the RF communications unit arranged for forming a frame, the frame comprising:
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a plurality of data units, each containing information fields containing user information; a first group of said plurality of data units including link control information for the purpose of addressing arranged in sub-fields that are imbedded in the information fields of the member data units; and a second group of said plurality of data units including encryption information arranged in sub-fields that are imbedded in the information fields of the member data units. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification